Tbi 454 heads. Is 292 820 There was a felpro gasket, figure its .


  • Tbi 454 heads 17084304 - Black / Blue - 74pph - 7. 4L / 454 - 88-90 89 K1500 Scottsdale 5. They also share the exact same displacement and bore x stroke of 4. gem. started with a 75 dollar 40 over 454, free PP heads off a running motor. com and he would love to tell you about his truck. Brown of Kansas City, Missouri, asks us if late 350 Chevy TBI heads will work on a carbureted 1970s short-block. While TBI heads have decent volume ports the flow is limited by the vane in the pocket. it might make sense to get a set of Smallport Bowtie Vortec heads I did some work to the heads while they were off and I machined just enough off the heads to give them a nice flat surface as the stock machining isn’t that smooth. Sort by Oldest first Oldest first Newest first Most reactions. thanks . com website, all figures appear identical. com FREE DELIVERY possible on eligible purchases Designed for 1987-95 TBI-equipped big-blocks, these new 50-state emissions legal (E. The stock 305 and 350 TBI unit has 2 (1 11/16″) bores which flow 450 cfm of air. It has a modified exhaust system and a couple of leaks. Currently running a 1996 full roller VORTEC 4 bolt Gen VI , big valve alum. i've had an 88 305 1500, 89 350 1500, 90 350 suburban, 90 305 1500, 90 454 3500, 92 4. tbi vs tpi, carb vs carb, 230 hp vs 290 hp-who wins? what is the best choice for a junkyard bbc build up? can the gen 5, tbi 454 make power? can it make gen The Performer 454 TBI manifold delivers outstanding performance for the street with complete emissions compatibility. 475" lift cams stock, have pressed in rocker arm studs and that the Vortec large and smallport heads accept up to 0. Save Share Reply Quote Like. $100 www. 73:1. 42 Email Report JCampbell Newbie Posts: 34 Loc: Southwest Washington Reg: 05-12-12. Trying to start gathering parts to replace the TBI 454 in my 95 C3500 with 144,000 miles on it. Joined Jan 3, 2019 Messages 10,835 Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads. Throttle Body Injection = TBI The 4. ive got pair on the chevelle, basically got a bunch of next to nothing. I tuned a 406 small block with a big solid roller cam, AFR CNC ported 210cc heads, tunnel ram and a pair of bored out 454 TBI units and 80# injectors @ 22 psi in both. Bumps compression on an L19 shortblock to around 9. 7 roller rockers. Henry Ford, on the stock market The Heads and intake are small or a peanut port. Truck has a NV4500 5 speed manual, and I'm keeping it in the truck. 31 gears. 10:1 gearing, sometimes 3. Part Number: EDL-60439. While the 454 served long use in RV's and some heavier vehicles, it generally was not ever intended for long duration heavy-duty use. The L29 heads were designed to provide torque throughout the RPM range but are not high performance heads. Paid $125, for sale for $50, can ship back to tbichips and reburn it for different setup. You can use heads off a later vortec 454. 42:1 in vans ) and the 4L80E was a 0. 454 with a Comp K11-302-4 cam. 15 lb TBI pressure regulator is a good idea. Soooo - heads The Heads and intake are small or a peanut port. I have made 330 hp with a set of stock heads. TBI is so simple you can pop out a 4. edelbrock. 458 flat tappet cam and matching valve springs stock GM rocker arms, Summit stage-1 intake + trans-dapt center mount TBI adapter UNPORTED stock The TBI units use a 1. tbi-superchargers. 193 casting TBI head flow data ————Intake——-Exhaust Valve Lift—-Flow 383, Comp Cams XR264HR (08-412-8), 9. Find CHEVROLET 7. 4L/454 Top End Kits and get Free Shipping on Orders Over $109 at Summit Racing! Gearhead Gifts - Find the Perfect Gift for the Gearhead on Your List! TBI 454 has me stumped. The closed chamber heads need to have the combustion chamber opened around the valves. I decided to try them after Vortecpro's car ran so well with the little port heads. They really have a difficult time flowing over 3,000 RPM! If you run The intake manifold was updated to a dedicated TBI intake, rather than a 4bbl carbed intake with a TBI adaptor. hit it with a little ether and shes up Funds will be quite limited. 7 Vortec engine (heads, intake manifold, exhaust manifolds, air cleaner, computer and dash-forward wiring harness). I ran a 12520270 Goodwrench L05 years ago. Send Private Topic ALL vortecs lose torque to a TBI head under ~4K. Edelbrock 60435 Performer RPM High Compression 454 O-Port Cylinder Heads for Big Block Chevy. 3, 5. Here is the pitiful flow data for those heads. Your second question, no I could not tell from your picture. 6. $1,191. 4l vortech l29 replacement heads stock heads Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you want to have your intake bored out you can run a 454 TB to gain more cfm. However, it had a 3. But milage will only get better by The TBI heads are the worst flowing heads GM ever released. you can do the ultimate TBI mods to I did some work to the heads while they were off and I machined just enough off the heads to give them a nice flat surface as the stock machining isn’t that smooth. The L29 7. 049's would be a good head but have 119cc chambers which As for headers, you could if you want but at that power level your just going to give yourself headaches with exhaust leaks and burnt plug wires. Up to 230hp engines that air flow is fine. zz4 camaro; lkn speeds vortec 350 tbi; jon’s budget vortec suburban; jims edelbrock 454ss project; bryans 412ci sbc torque beast; jareds blueprint 383 project; barrys 383 crossfire corvette; project red devil hybrid vortec Hi folks. 3964291. 3L heads are cheap and easy to come by but it does take a little modifcation to make them work with TBI but its worth the '88 Chevy K3500, aluminum head roller cam 511in³ stroker 10. However, Edelbrock makes a head with 100cc chambers and oval ports, if you're willing to go for aluminum heads. They also have their drawbacks: Stock TBI heads have low flow potential and using higher ratio rockers with an aftermarket camshaft may not improve power over the aftermarket camshaft alone since the maximum The TBI is being modified, Boring the throttle body to 54mm from 50mm, having it rebuilt and all the issues solved with throttle shaft leakage, and matching injectors with an adjustable fuel pressure regulator. 73s. 1018 parts at JEGS. Ugh. e 9. I've had TBI vehicles for years but never got into the tuning. So I am not going to recommend that. Just pick a cam, get the matching springs, pushrods and guide plates and source a used set of 049 or 781 heads to have redone. I know the stock TBI heads are not that great, but is there a direct bolt on head plum crazy tbi; project black magic; 454 project tow beast; budget vortec; blue whale vortec tbi; customers projects. jba shorty headers with a fu I have a 1993 k3500 454 NV4500 The engine is a semi fresh rebuild(50K miles) with a small cam. 6 rockers for alittle more lift, a typhoon dual plane intake, headers, and propane? Save Share Reply Quote Like. forged 9. M. 155 posts · Joined 2008 Add to quote; Only show this user #2 Find CHEVROLET C30 7. $150 454 Throttle body with adjustable fuel regulator inside. they have peanut port heads,and low compression. The Vortec 454 can have conventional larger sized fuel injectors installed into it if needed unlike its smallblock brothers which need an intake manifold change to install larger injectors. ) I did a 92 454 TBI into my 79 GMC with a few of the mods listed and it pulls pretty good, better than I The heads are off an early to mid 70's 454 truck. 5 out of 5 stars. (1) shows the location of the HEAD CASTING NUMBERS and the HEAD CASTING DATE located under the valve covers, in the rocker arm valley. 040. 1992-1997 GM The 454 TBI typically came with standard 4. So yes they look like 326K. Just pick the correct head gasket. It is a 99 454 block bored . The 8. Lbs. It obstructs much of the pocket entry and creates a flow direction reversal with respect to flow entering from the manifold into the port A set of decent aluminum heads for these engines is two grand. 108cc L-78/L-71/L-72/LS-6 Rectangular port 325cc intake. (tbi) 1991 454ci, it’s listed in the vehicle fitment list   Install: 275lbs @ 2. 1Closed Seat Pressure: 210lbsOpen Seat Pressure: 450lbsAll Speedmaster 23deg. I like the TBI adapter plate pictured below!!! The AE and PE needed for the Vortec heads is HUGE!!! The factory Vortec timing tables are a good place to start. good luck ,let me know on them ports if you pull intake . I know the 454 tbi is no monster power house, but for what we use the truck for it serves us just fine. 1987-1995 GM TBI - Throttle Body Injection. Thanks . Upgrading the exhaust is very worthwhile. chevy 454 cylinder heads 91-94 tbi rebuilt and resurfaced by lee's heads like new. 4L/454 Cylinder Heads Cast iron Cylinder Head Material and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing SpeedCard - learn how to get 15% back up to $150. LETS TALK TORQUE! FULL RESULTS-GEN 5 454 UPGRADE-STOCK PEANUT PORT HEADS. 5:1. www. 4 heads on your TBI short-bock would provide a small improvement in power. The 454 TBI is about 4. The second design TBI cam that came out in the 1994 models did improve the upper end and would improve the earlier Mark IV engines as the 156 heads that came on the Gen V engines was the smallest of the peanut port heads, the earlier peanut You will have an easier time due to having an older MarkIV 454. I've tried everything mentioned above and had one problem after the next which is what lead me to doing something insane like rewiring an entire truck and I just read recently purchased a 93 TBI 1 ton Chevy, that bad headgaskets. I found an old thread on the ThirdGen forum mentioning the 454 TBI may have trouble opening the throttle plates if mounted on a stock 350 intake. Cylinder Heads: Iron rectangular port; 118cc chambers. This is an older thread, you may not receive a response, and could be reviving an old thread. ported iron heads, edelbrock dual plane intake, Q jet by Everyday Performance. I found a set of heads off a 366 truck engine that had a more compact chamber and true oval ports. If 1988 or 89, those 454 engines have provisions for a mechanical pump. Last edited: Jul 30, 2024. Logged -Erik-1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s You can find peanut port heads on most 454's from the late 70's to the early '90's as GM used them through '95 with the TBI 454's. Note: Banks used to offer a power pack kit for the TBI system which increased the power significantly. 880 exhaust. The heads are off an early to mid 70's 454 truck. Its why the aftermarket is flodded with buget minded mark 4 heads. Already with L29 heads and a much better camshaft than the Gen V TBI engine. I would swap the heads over, get a TBI intake for vortecs and go that route. V8 engines with Head upgrades need the bored throttle bodies or you will lose power you paid for with those heads. 100cc Oval port. Nothing can be done to those heads to improve their flow numbers enough to justify the work done to them. Or build up the area on the TBI intake with JB weld and grind smooth. Peanut port heads are on my 1998 3500, with a 454. They told me that 396 heads would increase the compression and therefor increase the hp. Early versions of the 7. You will need a pump, a fuel pump pushrod, and a mounting plate, as well as gaskets and bolts. 8:1cr) Valve Springs for Hydraulic Roller; Port Volume: 290cc/110cc; Valve Size: 2. 0 Reply. with the th400 in the car ALL vortecs lose torque to a TBI head under ~4K. I know I'd need to get a vortec intake, and I'd also like to do a carb swap, so could I even get a 7. Looking for a good set of long tube headers for my 1987 R20 TBI 454 that fit well. Early TBI engines used a cast 4BBL intake which you can use the earlier intake and use the TBI adapter plate as a bolt on piece and use all the rest of the newer components and have them mount easily. An angle of 22. The 350 throttle body works fine at moderate cruising speed but runs out of ump above 4000 rpm. 3 CPI auto - under construction 01 Trans Am Ws6 - Garage Queen Someone said that you could only use the 2114 intake on a 96 to put vortec heads. I used a factory TBI manifold bored to 50mm and 454 injectors. I suppose there are Chinese knockoffs, but I don't have any actual knowledge of 'em. The only folks making a genuine TBI injection system-to-Vortec head intake manifoldis GM. Those old low RPM big blocks just keep on running. 454. Cylinder Head and Valves. while I don’t think I can quite get modern diesel torque numbers, I am going to try to get close. My plan was on putting these hea I just read recently purchased a 93 TBI 1 ton Chevy, that bad headgaskets. New posts Search forums. GM 113cc semi-closed chamber heads with peanut port intake ports(2. Running 10 to 1 Kieth Black pistons, a mild Comp roller cam and oval port Merlin Iron heads. Also a good true dual exhaust system. Shop Now at the Guaranteed Lowest Price! Performer Intake Manifold Small Block Chevy 4. Dropped it in the chevelle with a M20 muncie and 3. TBI intakes up to '90 have smaller runners, '91-on have same runners as Edelbrock Performer TBI manifold. the stock TBI fuel injection system is plenty adequte with a few upgrades. Milling the heads would would give you a little more Greetings, So I pulled a TBI 454 at the wrecking yard recently from a 1995 GMC 3500 1-ton van. Same answer to your first question. This set up was used on the Mark IV engines (1987-1990). we are looking at the possibility of some broken exhaust studs in the heads, which would likely mean removing them. Yes, every part can be ported and will improve the flow path. There is one in each head and it has one green wire coming out of it. I've tuned several Vortec heads with TBI conversions. $1,072. The Chevrolet Corvette with the LS5 I have a 454 tbi out of a1 987 chevy suburban and stock they have 230hp and 385 ft. Search by Make/Model. Firing order for the Chevy 454 is 1-8-4-3-6-5-7-2. 70. com or in the April 2013 issue of Hot The Vortec (L29) heads have a bigass ski-jump in the port, just like the crappy TBI small-block "swirl port" heads. 19/1. This is worth about 620 CFM which should support about 300 hp with better heads and higher compression and a better cam. Good for 50cfm of additional air flow which is fine on the 4. 0″. 2:1 compression ratio with flattop pistons in a 454. At least open up for larger tb. Used a larger The first one was a 350 with 9. I think a lot of you will be interested in this project as its a 50 state legal build running EGR, stock mechanical fan and even the smog pump on emission This might be a pretty basic question, but I'm wondering if anyone knows if 454 Vortec heads will fit on an older TBI 454 block. 3-bolt flange (14) Ball and socket flange (7) Stock flange (3) These heads flow as well as pretty much any other 305 compatible head out there and respond very well to some porting and good for nearly 30hp over the TBI 305 heads. 3. With zero deck and a 0. TBI 454 255hp @ 4000rpm 405 lb/ft torque @ 2400 rpm 454SS(91-93) and 94-95 3/4 and 1 ton trucks used 90 lb/hr injectors at 28-32 psi (high pressure system) ith some rework to be a strong compettitor. Air & Fuel Delivery; Books/Videos/Software; my dad has a 92 1 ton dump with a 454 tbi. Can any body help or explain. 5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap Email Report kzhurley 454 tbi/700r4/3. About 5000--5200 rpm is their upper limit; I'm told porting does wonders. 4 Liter Gen V (454 ci) RPO L19: 230 net hp (trucks only) Even though General Motors switched to the newly designated Gen V block, heads, and crankshaft in 1991, this workhorse retained the same RPO number as its predecessor: small oval (“peanut”) port cast-iron heads, TBI, mild hydraulic lifter cam, four-bolt main caps, cast-iron crankshaft. Racing Head Service (RHS) (4) FiTech Fuel Injection (1) make sure to use a fairly mild cam, otherwise the thing wont run. CAN YOU REALLY MAKE I had a very strong running tow rig a 94 dually with a TBI 454. With the complete Edelbrock Total Power Package 0-60 times improved by 1. O. Next would be heads and a cam them you would need a new tune a moded 454 TBI injector. TBI unit is a little limited in power production, you may have to change out injectors to get enough fuel into the engine when operating in the upper rpm band. Of course you can root around for a set of ok iron heads from a car 30 years older and save a few hundred bucks maybe after having them checked and repaired. Edelbrock Performer High-Compression 454-O oval port head has 100-cc semiopen combustion chambers that produce a 9. Even with work they arent as good as a i have a tbi 454 stock its going to have headers atleast its oval port closed chambers heads what cam would u recommend running i love the sound of a big block camming it wont be a daily driver its hooked to a sm465 in a 6500 pd rig with 40 38 to 42's I had a tbi 454 with headers and an aftermarket Affordable Fuel Injection harness and chip TBI Setup and Injectors. The list includes: less wimpy cam, hydraulic roller lifters, Edelbrock high compression heads, Edelbrock TBI intake, injector spacer, shift kit, long tube headers, 3 inch Buy Edelbrock 60499 BBC Performer TBI Cylinder Head - Assembly: Cylinder Heads - Amazon. Free Shipping; AFR 385cc Magnum BBC Competition Racing Heads 2020-TI. I just wanted to get my build analyzed by the professionals. Part Number: BRO-9992001-3. 4 TBI injectors. Estimated Ship Date: Today. I have the two wire coolant temperature sensor in the manifold just below the thermostat. It will really liven it up and it won't cost a lot in the grand scheme of things. But closed chamber GM heads are not in the same league as open chamber GM heads and definitely not in the same league as the Merlins. tbichips. New posts Latest activity. But for industrial use it is not as well suited or long lasting as the 366/427 family. Jump to Latest Fuck em' and feed them fish heads-Save Share Reply Quote Like. heads are easy peasy. The 454 aircleaner had a built in power bowl. 94-120-9. Joined Jun 14, 2021 Messages 51 Reaction score 58 Location CTS for gauges - between cylinders 1 & 3 on driver's side head I'm not sure on a 454 where they all are but on a SBC BigDaddy72 said: 1) MAP - on intake manifold passenger side of Throttle Body The 454 big-block crate engine is a robust, affordable engine that features an all-forged rotating assembly for great strength and impressive durability. 875 inch throttle which is the same size as the 2bbl, 454 engine’s Rochester just split into two pieces for your engine. This might be a pretty basic question, but I'm wondering if anyone knows if 454 Vortec heads will fit on an older TBI 454 block. On the front was the AWH code which came back as the 89 truck tbi. ddeennis. 4L/454 Chevy big block Mark IV Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App. The Vortec water pump isn't the same as the TBI water pump, use the TBI pump and accessory system. Compression ratio and It had headers, modified TBI, 190lph fuel pump, a bit higher fuel pressure, Comp TBI Cam and Edelbrock TBI intake, along with some retuning of the computer. Trying to keep myself occupied, I figured I might tinker with the TBI. Truck was originally a 454, but previous owner swapped in 350. Lots of BBC info on the net, including casting number ID for the heads you have. Round (8) SAP (6) Square (4) Rectangular (2) Get Results; Collector Attachment . 3964292. The TBI 454 engines cam with a slightly smaller unit that the Holley at about 590 cfm. Valve Size (in. Search Within Department. 468 posts · Joined 2011 Add to quote 1990 454 ss TBI . Here is a short video of the TBI Heads ported by Thomas. Our TBI setup hinges on precision, with the throttle body injectors releasing the optimal amount of fuel. 15 (2) Ships Today FREE Shipping Lowest Price Guarantee. 19"/1. I changed out a 350 in a 79 C30 Dually to a 92 454 TBI, man what a difference. But they operate at a higher PSI (9-13 350/305 vs 26-32 454) which is determined by the fuel pump and fuel pressure regulator, not the injectors. They have a 100cc chamber which will maintain your compression ratio. I've been reading up on the various modifications, spacers, grinding off the lip around the bores, etc. (EG: is a 1995 454 TBI motor the same as a 1990 tbi motor - if not, what changed from year to year) Hopefully this isn't to big of a query. 1829 posts · Joined 2003 Add to quote; Only show this user #5 That's the only one I know of. A 454 vortech 7. I'm looking for Cylinder Head, Performer RPM 454-O High-Compression, Aluminum, Assembled, 100cc Chamber, Chevy, Big Block, Each. The peanut port tbi heads respond well to porting and even slightly larger valves. I have worked on numerous dozens of examples of both the TBIs and L31s both stock and modified. You can swap a set of small cc (intake runners) Mark IV heads and an aftermarket intake and a small cam, but the TBI won't support the added power. 4. Valve springs and a good magnaflux and valve job will cost you a couple hundred or more and that money could have been spent on decent new heads. 4, or even putting Vortec 7. It you want more them you need to build a tbi motor. It should be vastly better than stock and will definitely require some tuning to make the most of it, but is still on the mild side. injectors @ 25psi, stock Vortec ('96-' Any idea if it is worth it to replace the stock "193" TBI heads with say a set of 487/993 heads from the early 70's without any other mods except opening the center intake holes to align with the old heads? Any real value here. 1992-1997 GM I just repaced it with a 383 vortec heads with a GMPP marine intake already bored out to 2". Unless I can steal a pair of good heads, I'm stuck with either the factory TBI heads or a set of Junkyard Vortec heads. 73 gear, headers, and dual exhaust. 3L tbi If it is a 396, is there any gain to using 454 heads and parts. com chip for a '93 350/4L60e with vortec heads and compcam. Stock 454 TBI uses a 2" bore , same as the Holleys , the only way I have a GMPP TBI intake bolts to VOrtec heads. On the block side of the head. Racing Head Service (RHS) (4) FiTech Fuel Injection (1) I am new to factory ecm tuning and have a 94 Chevy dually with a TBI 454 with a 7427 ecm. The TBI heads are way down the list as far as the bottle neck goes in power. 4L used an old low-rise Q-Jet intake plus a huge adapter with a water-jacket and hose nipples to The diagram above shows where each of the casting identifiers is located on the engine. The 454 is larger with close to 2 inch bores. 6:1, TBI (193) heads, Holley Pro-Jection intake, 454 throttle body with 80lb. 4L TBI engines. im running a 1993 bravo 330 454 with flat tops pistons and 10141279 vortech heads lunati flat tappet tbi camshaft edelbrock tbi intake port matched to the large oval heads with the right tune it might make 400 with the 4l80e and 14 bolt with 373 it is better on fuel than a stock 1990 454 and way more drivable if you have pop up pistons and large chamber heads your I recently purchased the better portion of a 1996 5. 7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap 95 C2500 Cheyenne 6. compression & free flowing exhaust is a good starting point. i. Part Number: EDL-3764. 4L/454 Headers and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing SpeedCard - learn how to get 15% back up to $150 Cylinder Head Port Shape . Small Block Chevy heads are Good luck trying to find Vortec 454 headers for anything less than $450; all that I've found for around $300 are TBI headers and I've got no idea if they work on the Vortec heads. Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Make/Engine Search Due to the insane cost of 454 cores we must charge a $150 core charge for all complete 454 builds that you buy directly from us. The second design TBI cam that came out in the 1994 models did improve the upper end and would improve the earlier Mark IV engines as the 156 heads that came on the Gen V engines was the smallest of the peanut port heads, the earlier peanut I have a one wire sensor in between the middle ports on my 1991 V3500 with the stock TBI 454. Any suggestions would be greatly appreciated. I have not found concrete feedback on physical size and flow rate differences between 5. Newer variants of the 454 use aluminum heads but share the same cast iron block. Get the Best Performance with Speedmaster SuperStreet-Series Top End Engine Combo Kit Big Block Chevy 454 PCE435. B. Will the 2114 work . ready to go $650 set alvin area Edelbrock Chevrolet Throttle Body Injection (TBI) Performer Manifolds are dual-plane, low-rise intake manifolds with a 180-degree firing order, and a patented runner design that delivers outstanding performance with crisp throttle response. as far as the heads for tq at low rpm the smaller the port the better for velocity. The previous owner told me that the truck had been converted from a 454 TBI to a 350 TBI before he got it. i started building a 75 year 454 in case the heads have poor intake ports . I'm finally going to do it. The 454 TBI motor just isn't hacking it in the mountains. They are just poopy heads any way you slice it. I just did this swap using a 781 head but all the parts fit without issues. Post: '89 V Series 3500 TBI 454 convert to carb (Topic#213998) Treefarmer Forum Newbie Posts: 29 Loc: New Hampshire Reg: 03-30-09. 3 injectors. performer intake and a comp 260H cam, just a basic truck motor. Ive decided to use Edlebrock heads and inlet manifold. 750 Holley on top and Hei ign hope this This is good for 360 hp which is probably closer to what a 383 with Vortec heads is capable of. Reactions: Volunteer454. I get the code 32 for the egr occasionally when driving the truck. Seeing that the normal Voretc 350 L31 heads dont accept over 0. 25+ bore. The Gen V 454 (1991-1995) got a 1-piece where the heated passages are internal in the intake. After that the Gen V 454's used Vortec heads. 5. BOTH would lite the tires up. The stock exhaust manifolds work if you port them out as well. 7 and 7. 56 geared truck). The first one was a 2-piece unit using a 4bbl carb intake with a coolant heated spacer. They are controlled by a computer system that adjusts the pulse width of the injectors to vary the fuel Early TBI engines used a cast 4BBL intake which you can use the earlier intake and use the TBI adapter plate as a bolt on piece and use all the rest of the newer components and have them mount easily. I built this project primarily to show that you can NOT make big power using the poor flowing TBI heads. Krum, TX. All can put out 400 hp with intake, exhaust and a proper carb. The Vortec 454 will kick it's ass but then you have the occasional expensive battle with the injectors (don't forget the regulator and be careful with the somewhat fragile fuel rail), and the POS plastic distributor that the cap tabs break off and the bushing up top wears out. 73 gears (originally a 4. " NICE" piece of shat. 7 injectors in the larger BBC unit and added an adjustable fuel pressure reg. It had the My engine is a 454 from the mid 70s and has a 750 carb, headers, comp cams stamped steel roller rockers, heads are stock, TH400 trans, NP205, 4:10 gears. [they make a special head for this model,]roller tip rockers,and performer cam and a set of block hugger headers,should get about360 hp with this set up and loads of torque. 0 and 5. hit it with a little ether and shes up 455, 472, 500, 502. The video does not do it justice. 396/402/427/454. TBI Wiring Harness. they are a great improvement over the peanut port heads, yet still provide the torque needed to move heavy vehicles and loads with efficiency. 94/1. Check your head casting number, is should end in 383, Comp Cams XR264HR (08-412-8), 9. small cam and efi heads ( small port ) and makes tons of tq Converting Your TBI to a carbuator isn't that difficult as long as you know what you are getting into. TBI 454 255hp @ 4000rpm 405 lb/ft torque @ 2400 rpm 454SS(91-93) and 94-95 3/4 A Vortec 7. It gained 70 rwhp over the factory cam/vortec head configuration and 40 ft/lbs at peak with gains Find 1990 CHEVROLET 7. "I" would just put the TBI intake manifold on the Vortec long-block, install the TBI distributor, and connect everything as if it were a TBI engine. I am currently putting together a 454 for my Suburban to pull 9000 lbs with regularly. They are more like the old Mark IV but with m0dern components like roller cam and one piece rear main seal. To make that 454 really run, you'd need to toss the heads and intake, as well as replace the cam. It is recommended a TBI from about the same size engine to be used in your conversion or larger for high performance built engines. (2) shows the position of the BLOCK CASTING DATE on the rear ledge of the block near the bell housing mounting surface. also added a set of Edelbrock headers and a custom exhaust View media item 32352Pic: Intake sitting with TBI head on the left, Vortec head on the right. If I get a burette any time soon, I'll post the cc. Injector flow of about 70 lbs is about ideal! Get the Best Performance with Edelbrock 60439 Performer RPM High Compression 454 O-Port Cylinder Heads for Big Block Chevy 60439 parts at JEGS. There were 2 intake setup for the TBI 454 engines. 3 and throw in a 305, 350, or 454 just by plugging it in and swapping the chip. Joined Jun 14, 2021 Messages 51 Reaction score 58 Location CTS for gauges - between cylinders 1 & 3 on driver's side head I'm not sure on a 454 where they all are but on a SBC BigDaddy72 said: 1) MAP - on intake manifold passenger side of Throttle Body I used 396/350 heads, those absolutely must have new seats in them, I use the seats for natural gas engines now. Due to the insane cost of 454 cores we must charge a $150 core charge for all complete 454 builds that you buy directly from us. 4L / 454 - 91-93 5235231 - Red / Blue - 80pph - 7. The TBI unit. and I wanna build it for towing does anyone know what I can do to build it for more torque. Check out the 4x4 series cams or towing cams. They do make a gasket Vortec 454 has a factory roller cam. Is 292 820 There was a felpro gasket, figure its 3. And it's fantastically expensive. Any suggestions would be greatly Forums. Or, even better, take the money he was going to spend on porting, and instead buy Vortec heads and the TBI/Vortec intake. 4L/454 Intake Manifolds, Fuel Injected and get Free Shipping on Orders Over $109 at Summit Racing! Edelbrock Performer 454 TBI Intake Manifolds 3764 Intake Manifold, Performer TBI, Aluminum, Natural, Throttle Body, Chevy, GMC, 454, Each. 1 pistons or 18cc dome pistons with 156 casting heads. This is the combo so far 454 standard bore shortblock Dome pistons 781 heads milled for 9:1 compression (Bigger valves VORTEC all the way. 530" lift stock and have screw in studs and flow much better on the exhaust than the stock L31's. My options seem to be: Use my MkV block, retrofit a nice hydraulic roller, get some L29 heads for a little bigger port and smaller chamber to bump up compression, and use an TBI 454 255hp @ 4000rpm 405 lb/ft torque @ 2400 rpm 454SS(91-93) and 94-95 3/4 and 1 ton trucks used 90 lb/hr injectors at 28-32 psi (high pressure system) ith some rework to be a strong compettitor. If i take the truck for a short drive when i come back and go to instantly restart it has no fire from injectors. Reactions: PlayingWithTBI. 73 12 bolt, 700R4, 12" discs front 10" rear. Jun 28, 2021 #2 BigDaddy72 OBS Enthusiast. This is the delima i have with my trail rigs 454. zz4 camaro; lkn speeds vortec 350 tbi; jon’s budget vortec suburban; jims edelbrock 454ss project; bryans 412ci sbc torque beast; jareds blueprint 383 project; barrys 383 crossfire corvette; project red devil hybrid vortec Find CHEVROLET 7. ) I did a 92 454 TBI into my 79 GMC with a few of the mods listed and it pulls pretty good, better than I 396 closed chamber heads on a tbi 454 picks them way way up on tq and hp . It was mostly complete. the 454 truck tbi system is easy to tune with very affordable hardware, been burning chips for these trucks for 20 yrs. etc. I Big Block Chevy Intake Manifold (1) You will have an easier time due to having an older MarkIV 454. 5:1, much better ports, they're not the heads to use for a 7000RPM motor but for street heads they're decent and hard to pass up for the money. tbi vs tpi, carb vs carb, 230 hp vs 290 hp-who wins? what is the best choice for a junkyard bbc build up? can the gen 5, tbi 454 make power? can it make gen chevy 454 cylinder heads 91-94 tbi rebuilt and resurfaced by lee's heads like new. Location is approximate. I do have the 454 TBI and Forums. if you raise the rpm then you need better flowing heads at that rpm level. $500, maybe more by now. it has been squared and zero decked. It pulled like a beast, even with 3. Performer #350-3764 is a stock replacement/street legal part for 1987-90 plum crazy tbi; project black magic; 454 project tow beast; budget vortec; blue whale vortec tbi; customers projects. Not Yet Reviewed. 72 stock valves), GM 3/8ths rods that have been shotpeened and beam polished for durability. These are great looking heads. I now carry a AC Delco 155lph EP381 pump which is more than sufficient for any TBI application and is only $90 shipped through my ebay store. 1985-1992 GM TPI - Tuned Port Injection . 50. The Square Bore is about 3. Still a very simple system, but with more power. Top. 94 GMC Noma 4. First time poster. You can typically bump base timing a degree or two, and shim the fuel Most of my 454 customers are 1 ton, suburban or motorhome customers, so I am going to build a torquey TOW beast. 4L V8 were able to deliver 360-450 horsepower and 500 lb-ft of torque. The later generation engines were different. tbi motors need a good vaccum signal to run, higher lift and shorter duration will net u the best results, more flow while maintaining driveabilty. (Photo Courtesy Edelbrock) Edelbrock/Musi Victor 24-degree CNC large oval port head is fully CNC machined and assembled for 950-plushp potential right out of the box. 15hp gained from its better cam and 30hp from its better heads. 4L/454 Chevy big block Mark IV Cylinder Heads Assembled Cylinder Head Style, Rectangular Intake Port Shape and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App Final Day! TBI Setup and Injectors. The biggest bang for the dollars is a chip tune and exhaust followed by a K&N air filter rv cam headers Edlebrock manifold and a moded TBI matching injectors and a adjustable full pressure regulator. Stock TBI unit flows 450cfm and that maxes out at around 250hp. I have replaced the following some parts multiple times The truck has a stumbling rough idle. /hr. 2. It gained 70 rwhp over the factory cam/vortec head configuration and 40 ft/lbs at peak with gains Wendell T. I have a 89 4. 449/. Note the gap at the top of the intake port and the bolt holes above the manifold mounting surface The Vortec heads are missing the coolant bypass hole that the TBI and earlier heads have. Intake has been clearanced for the 454 THrottle body. This patented design greatly improves torque over a wide rpm range, especially off-idle through 5500 rpm. The 2bbl TB EFI system remained. Make the plate big enough to cover the 454 TBI passage. 5 valves Comp 212/218, . It will make a flat part to and given that a single TBI unit could easily feed the air and fuel needs for either a 230 fwhp TBI 350 sbc, or for a 255 fwhp TBI 454 bbc. The small chambers would really help the squeeze. and would this be a direct replacement without modifying the computer. 95. 3 tbi and some vortec heads off a silverado. Edelbrock 3764 - Performer 454 T. I had Here is Jim’s 1990 TBI 454SS play toy. 75:1 The TBI isn't the 'biggest' restriction to overcome on a stock late-80's/90's 454 - it's the heads The TBI 2-port throttle body (flow @600cfm), the intake and the Peanut-port heads are barely capable of 350HP MAX. heads , comp cam 598/601 lift , open headers , 950 holly ( soon to be injected ) OH and a 100 shot of squeez. my bbc is 9. Actually TBI can support more than that. They used peanut ports in the article. 35-5. Member. 1829 posts · Joined 2003 Add to quote; Only show this user #5 I used 396/350 heads, those absolutely must have new seats in them, I use the seats for natural gas engines now. injectors @ 25psi, stock Vortec ('96-' 3. 5 and higher you will have to run high octane fuel. 1966 Chevelle wagon, 408 SB, 3. So swapping injectors leaves you with lower flowing, and under pressured Injectors. Heads, vortec 4. 454 injectors are the worse for having Put a 1" tall open oval center 454 spacer on it with a 2" bore 350 Marine TB and a 454 air cleaner and duct. GM changed to Vortec heads, and tune port injection. No high compression pistons or radical cams tbi will not accept it. 60" from outside to outside of the throttle blade opening. Get a ballpark dollar amount in your head and see if it's really the direction you want to go. Aside from the iron heads it is a hot rod motor. I wanted to use the TBI system, but due to the very poor condition of the TBI The first thing we needed was a small-block Chevy engine on which to evaluate power. 1990 454 ss TBI . They are controlled by a computer system that adjusts the pulse width of the injectors to vary the fuel Pulled the 454 out of my wagon to try to fix an oil leak. Since this was a low-buck cylinder head test, we decided to use our budget small-block 350 Slayer engine. The heads, if this is a truck engine, are the infamous Swirl Ports they are a prime limiter of performance as the vortex generator within the port provides a significant impediment to mixture flow above 4000 RPM. 06/1. 7 TBI's are all the same CFM with 1 11/16th bores. which is nice, a upgraded tbi unit, intake, heads and exhuast and it'll make wonderful grunt and tow well. Send Private Topic BBC heads: 454 Passenger and Trucks, 113cc chamber, 255/114 ports, 1971-1984 Block:14015445 1978-1990 454, 2 or 4 bolt 88' K3500 HP ratings: 230hp @ 3600rpm 385lb/ft @ 1600rpm Cylinder Head, Performer RPM 454-O, Aluminum, Assembled, 100cc Chamber, 295cc Intake, Chevy, Big Block, Each. 65 posts · Joined 2009 Add to quote; Only show this user #6 · Nov 8 Hello everyone. Oh , and the Vortec F/P or a TPI pump will be fine. and given that a single TBI unit could easily feed the air and fuel needs for either a 230 fwhp TBI 350 sbc, or for a 255 fwhp TBI 454 bbc. ): 2. If you click them and make a purchase, we may earn a small commission. I have read they dont flow much better, but the chambers are smaller which should net me higher compression and a TBI set up off my 454, GM-1 454 heads - $500 no issues when pulled 454 factory TBI setup, throttle body, new injectors, coil, distributor, air cleaner, brackets etc - $400 Almost new 454 exhaust manifold, Dorman brand new- $150. 5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS Head Combo, Intake, Head and Intake Bolts, Valve Covers with Studs and Nuts, Gaskets, Spark Plugs, Kit. Someone swapped an earlier set of oval port heads on itbottom end looks all stock and its a 4 bolt main, double roller timing chain. 1968 GMC 3 door Suburban C10 454 4L80E EFI All for sale. It ran well, puled even better, and got decent fuel mileage as well. (The larger port at lo RPM tend to run wetter because the fuel falls out of suspension. I would loose the Holley TBI and find a good 454 Unit . What's new. Edelbrock used to make some heads that are for the TBI 454 engines, but they were peanut port heads. CHECK OUT THIS VIDEO WHERE I UPGRADED A 1992, GEN V 454 WITH PEANUT POmore. 1970 ElCamino 440ci "Baby" BBC Big Shot Plate TH400 w/Brake 12 bolt Best#'s- 1. Once the head gaskets have been replaced, the truck now runs fine, until fully warmed up then it sets a check engine light for a code 43. This suburban is even more budget than my budget vortec truck was. If you have any questions for him his email is jarbird67@hotmail. The TBI 454 injectors actually flow LESS then the 350/305 TBI injectors, they are almost the same as the 4. I'm going to put headers and true duals on the truck but want to turn off the egr completely. Then added an Edelbrock performer intake (with EGR) and used the adapter from a 90 model 1 ton with a 454 and the larger TBI unit also (the adapter fits on a Q-jet or spread bore base) and used the 5. My options seem to be: Use my MkV block, retrofit a nice hydraulic roller, get some L29 heads for a little bigger port and smaller chamber to bump up compression, and use an 7. I have Vortec heads on my 350 with a GM Performance Parts TBI intake, and just ordered a full throttle body from a 454 truck. 1829 posts · Joined 2003 Add to quote; Only show this user #5 TBI being simple, also chokes down the 454, and these short comings were addressed in 1996 with the Vortec family of engines. NOTE: Blueprint Engines no longer makes a TBI compatible engine so I talked ATK into modifying their HP94 engine to be Title kinda says it all. I've got an '87 Suburban 454/Turbo 400 TBI engine that I was considering keeping the TBI on, but I really can't get into having the injection system on an early '60's style gasser project. 25″ x 4. But milage will only get better by Vortec heads have become the basics for many TBI project vehicles and for good reason. This is a Blueprint engines 383 TBI with the world heads option. Find out the answer here on HotRod. 7:1 compression with the 12-256-4 cam with 175cc Trickflow 87-95 heads. 42s, the other with 40" boggers and 3. I now carry a AC Delco 155lph EP381 pump which is more than I have a 1993 k3500 454 NV4500 The engine is a semi fresh rebuild(50K miles) with a small cam. Either of these requires modification to an intake to accept the Hello, I've got some noob questions. My experience with the stock peanut port 454 is the cam and heads give up too soon - around 3500 RPM. MXrider13 Discussion starter. Same intake runner volume of 290cc, same exhaust runner volume of 110cc, same combustion chamber volume I've successfully used a Comp X4 262H in a heavy work truck with a 454 TBI, and an automatic transmission with a stock converter. my buddy put 2 hot a cam in his and the computers stock programed parrameters cant figure out why the thing wont read much of anything with the map sensor. The View media item 32352Pic: Intake sitting with TBI head on the left, Vortec head on the right. It had early model closed chamber oval port heads, not Vortec heads. Registered members Current visitors. I bought a Moates Burn 2, HDR1, and a G1 adapter I need to tune the TBI to see if it can handle the engine I recently installed in my truck. I wouldn't waste my money porting 193s though. Aside from what's mentioned above about swapping out to the TBI injectors from a 454, there's just nothing that can be done to increase the volume of fuel that will flow through one of these. The result Pretty much headers with a decent exhaust and a decent air induction system, beyond that is a jump. Therefore, most folks use a carb intake for Vortec heads, plus a TBI adapter plate. It was a 4x4 tow truck square body, it would light up the Duallys! Jeff the guy Is it the same block as the original 454 just with TBI or is a new block? The '90 Mk IV SS454 truck engine had "peanut port" heads, all were TBI AFAIK. A bit larger ovals would help, but at slow engine speeds, the intake runners will get wet and rain. 59-141 Getting it done with 10" 2015 Pinks All Out 8-9sec Winner. Went with Etec170s, a Comp XM270HR, bored out the GM TBI manifold to 2" and put a 454 TBI on it. b454rat said: I had 2 TBI 454 trucks, one with 35s and 3. The tbi 454 can make really good power even with stock heads. Seems to lack power to me but im not sure. We have overhauled/restored over 4000 TBI units since 2006. #D-215-33) heads have a 100cc combustion chamber for an increase of over one full point of compression to 8. 70 seconds (includes manifold #350-3764, cam kit #350-2162 and Tubular Exhaust System). Out-of-the-box Vortec heads had a slight flow and power advantage over out-of-the-box "round port" heads. The injectors are different sizes. runs great pulls hard to 4500 rpm for a heavy car. The biggest problem though, is that the 454 TBI engine is simply the old 454 truck engine with low compression, a flat intake, and very small port heads, they just stuck an adapter for the TBI unit on it and swapped distributors. Long block yields I agree. D. The early TBI 7. Late 90's to early 2000's Volvo Penta, Mercruiser TBI. Vortecs are respectable engines. Make sure the head port (oval or rectangular) match your intake. The other option is an LS with a power adder. With better heads, intake and a 4-port TBI system the stock 454's can make @450HP pretty easy with a mild cam. 23:1 in pickups, ( rumors of 3. User Info. Search by Make/Engine. 50s. Part Number: EDL-60435. Supporting Member. Reply: drmsofhv. Jared has a nice 4×4 project here that visitors might find interesting. ready to go $650 set alvin area for gas reasons if you want to run high comp. Send Private Topic View Profile. Peanut port heads are good for low RPM torque, but get all choked up around 4500 RPM. I need to tune the TBI to see if it can handle the engine I recently installed in my truck. 6" from outside to outside of the throttle blades. 8:1 on 7. This suburban is running all stock, restrictive original TBI exhaust as well as the tiny little 42mm 450cfm throttle body. Vortec ‘906’ heads, with ‘street port’ special, 3 angle seats + summit 1. Gm did use peanut port heads on 454's and 502 truck engines and still sell them today. 3 1500 that is now 454. Stock TBI 454 heads are horrible. The 472 and 500 cadilliac can handle a constant 100 shot and a rare 150-200 shot in stock form with stock heads. This is a short vid explaining what you need to know b the 454 truck tbi system is easy to tune with very affordable hardware, been burning chips for these trucks for 20 yrs. The TBI engine had peanut port heads, mild cam, headers and Edelbrock TBI intake. com have a nice little supercharger kit that is reasonably priced and will give you V8 power from your little V6. On the www. While I ran 80lb/hr 454 injectors . . And get larger cop car or 454 TBI injectors and use your Vortec shortblock with the TBI I wanted to put the Eddy TBI heads on as mentioned before. Oct 8, 2020 #8 PlayingWithTBI 2022 Truck of the Year. I have read that the '94 - 95 454's ran a higher 29-32psi Find CHEVROLET 7. Search Within Results. (Photo Putting a 98-99cc head will not yield 9:1, but actually closer to 8. Are you looking for long tubes or shorties? Unless you find one hell of a deal on Gen 6 454 truck headers, I would suggest shelling out for a decent set. I've got a '94 C2500 w/ a 454 that I've made some mild upgrades to. 69-70. I was just wondering, what, if any differences are there between Edelbrock's Performer 454-O #60479 and their Performer RPM 454-O #60459 heads are. Significant HP gains can be had with better heads, cam, exhaust and intake. If you're starting with a bare 400 block and not much else then 550 hp that's streetable is going to seriously hurt the budget, especially one that has the low end torque you're after. mikenholly07. Even with work they arent as good as a If it's a first generation BBC (70's-80's) it probably has oval port heads-rectangular port heads were early 396/427/454 HP units. 190 intake / 1. 1966 Chevelle Malibu 489, 870 Holley, Edelbrock RPM Air Gap, aluminum heads Patriot 315, TH 400 Gearvendors OD/UD, 12" disks up front and 9 inch with 3. 75:1 OD, while the NV4500 is 0. Big Block Chevy 396-502ci (1987-1995 454 TBI engines will yield 8. 5 degrees with an adapter thickness of 1" is required to make the transition. Henry Ford, on the stock market For fun factor *combined with* reliability, I'd go with the TBI 454. Get some decent old-school heads and then hog out the holes on the TBI intake so it bolts up. at the same time Of the cam install, I will be looking to use Vortec heads (smaller combustion chamber 100cc to raise compression to Cylinder Pressure Note: youll generally want to try hard to maximize the useable compression as the higher the compression before you get into detonation the more efficiently the fuel can be burnt and the more torque the engine can produce, if limited to pump high test 92-93 octane fuel,165 psi # of cylinder pressure is about the best cylinder I'm waiting on getting things lined up for the 454 rebuild, in the meantime I'm driving the 89 1-ton around with the tired motor. Free ShippingLoading Estimated Ship Date: Today. I was dead set on an EBL as I wanted to go that route on Find CHEVROLET 7. Joined May 23, 2016 Messages 1,762 Reaction score 2,041 Location Michigan. 25 out of 5 stars. 04-07-09 01:17 PM - Post# 1671000 I recently purchased a 1989 V Series Chev truck 454 TBI. 042 head gasket over flat top pistons, 100cc will be pretty good. The throttle body was there but the injector pod and injectors were gone. 1989 s10 4wd 4. 5. Currently it has the stock 350 TBI. The 454 serves good use as a light duty truck engine in pickups and 1-ton and less sizes. Members. What is the hp guestimate on a 13:1 compression 350 with ported tbi heads, comp cams tpi cam with some 1. You may simplify things if you bought a used L29 Vortec engine. If your rebuilding the motor, don’t waste ANY money on those pitiful poor flowing TBI heads. The Gen VI L29 came with a flat-top piston and is a true 9:1 engine with the 99cc Vortec heads. 4 vortec carb intake? I'm The 454 TBI typically came with standard 4. 3L V6 TBI (0) $566. Plan it out first. JeffN. I know I'd need to get a vortec intake, and I'd Upgraded Vortec cylinder heads, a more aggressive camshaft, and reprogramming TBI chip to make 300 horsepower or more with a GM Chevy 305, 350, and 454 engine with The 156 casting Gen V/VI "peanut port" TBI heads have the smallest intake port of any of the big block heads. From 1990 to about 95-96, those are Mark V engines. Free Shipping; Edelbrock Performer RPM Cylinder Heads 60459. Jul 22, 2024 (tbi, intake, heads and loom) - so if i could get some direction here, i might be able to scoop those parts from him for a good price. J. comp magnum 1. Oct 23, 2020 #8 DerekTheGreat Forum Regular. I have some brodix bb3's and bb2 extras sitting around. Reactions: Drunkcanuk. Long block yields TBI being simple, also chokes down the 454, and these short comings were addressed in 1996 with the Vortec family of engines. A Vortec 7. 0 comp. Save Share Doesn't sound bad. Without a coolant bypass circuit you will get weird overheating 454 1991 Hi im building up a 91 454. Doesn't accomplish much on a small 396 bore but does work better on a 4. Not sure of the actual HP number but it was in a 41 Chevy backed to a 4L80E and scared the living hell out of me to ride in. Without a coolant bypass circuit you will get weird overheating It has the 454 engine in it, and I was kind of surprised that it doesn't have more power than it does. 4 Vortec heads are pretty good. I have built quite a few 454 combos with the Vortec heads as well as a few 496's , excellent performer for the $$ spent , the heads will support more than most think . 88" 100cc Both engines can benefit a LOT from higher flow cylinder heads and cams. Tbi will not accept narrow lobe center. 88. 77. 35 SAVE $119. I have a 1976 tbi 454. Rect port heads on a 454 'will work' but oval/roval ports 'will work much where is the location of temperature sensor on 454 chevy motor Home repair shops we call and have them look at the wiring schematic in AllData to tell us where a sender/sensor is on a head and FUEL PUMP, FUEL FILTER, DISTRIBUTOR(TWICE), SPARK PLUGS, INJECTORS, CABLES, AND TBI REPAIR KIT AS WELL. 3 1500 that got 305 swapped, 94 305 1500, 94 350 suburban, any my current two 92 3500HD 454 and 90 4. My machinist said there are differences between the 305 and 350 TBI heads, but you'd think the casting numbers would narrow it down more. On a header system the Oxygen sensor almost always ends up being located further away from the cylinder head than Post: 1988 Chevy Cheyenne 3500 4x4 454 TBI engine specs (Topic#57277) 9C1guy Member Posts: 16 Reg: 02-06-03. The 454 TBI engine came with a bigger 1-7/8s throttle bore unit and Holley has several 2 inch versions rated at 670 CFM. 3L and the v8’s with STOCK TBI heads. Although there's still TBI tuning to deal with if you don't swap to a carb. lqwavh iodpmq vugal loxw esynyzm uxpmy dsjlfdr heoifiw piom rqutj
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