Chevy 4 7 swap 74-10. 646ex 110 $306 for a standard cam $347 for a billet version $397 for a billet version with the 4/7 swap but my question is what are the pros and cons to the 4/7 swap other than the $50 charge? Find Howards Cams 4/7 Swap Camshafts and get Free Shipping on Orders Over $109 at Summit Racing! Howards Cams 4/7 swap camshafts are ground in-house, so each cam is manufactured on precision cam grinding machines—not re-boxed like other companies. May 19, 2009 · The title of the thread mentions your 4,7 swap cam Then You said "I usually start with TDC etc. You can theoretically swap any of the cylinder pairs that are across from each other on the distributor cap. 528 1. Submit Review. 77:1 comp Comp Cams cca-12-609-5, solid flat tappet 1. With a 90* V8 with the 90* 4-journal crank, 2 cylinders are at TDC at the same time. 302 firing order is different and is the same as an LS Chevrolet engine; 3/5 & 7/4 swaps with a Ford sequence and 4/7 & 2/3 swaps with an LS Chevy sequence. I can't begin to explain how much better this new exhaust sounds over the side exit exhaust. Oct 14, 2024 · The standard SBC firing order is 1-8-4-3-6-5-7-2. We are presently working on a Big Block chevy roller core with this firing order, but we won't have them available until fall. 3 V6 to 5. Sep 10, 2018 · The 4/7 swap is better in any V-8 chevy for better loading and harmonics on the crankshaft and mains. 3 has the knock sensor on the top of the block behind the intake, and the v8 doesn't have a spot for it there. The 4 & 7 swap firing order cams have been dyno and track tested in a variety of applications. A. The 4/7 & 2/3 swap is even better. 5 Jan 17, 2016 · About 5+ years ago, the 4/7 swap camshafts started appearing in catalogs. Uratchko Racing Engines Uratchko Competition Designs. We've been doing the 4-7 "swap" for MANY years in Chevys (mostly small blocks). It was a lot of work to redo the headers and tuck the pipes unde Summit Pro SBC Stage 6 Hydraulic Flat-Tappet 4/7 Firing Order Swap Cam, 242/248 Dur. Jan 23, 2012 · Starting it with the 5. 3 tbi and I have a second motor that is a 94 5. 3 for a 355 I am building and was curious as to what exactly would be necessary for this swap. 630"/. 7 chip from an automatic was interesting. Dive into the technical details and reasoning behind this innovative approach, perfect for enthusiasts seeking more from their engines on 87-octane gas. Thats 1 day ago · Summit Pro SBC Stage 8 Hydraulic Flat-Tappet 4/7 Firing Order Swap Cam, 252/258 Dur. It swaps 4 & 7. One core company is ofeering a few popular sizes in a 4/7 - 2/3 but not many. I dont think 20MPG would be out of the question with this combo with more power than the early 4. " that implies that you already know how to adjust valves and that your only issue was that you now have a 4,7 firing order swap camIf you didn't already know how to adjust valves you should have said so, I would have been more specific. 3 LS swaps and a nice 8 speed transmission. “Other issues involving air and fuel distribution can be addressed with manifold design or in the fuel system. 8/5. 7 into the 95 and used the wiring harness, computer, engine, steering column, gauge cluster, and 4L60e from the 98. Review. 0 or 5. the 4/7 - 2/3 . If you look at the chart, all 3 have adjacent cylinders competing for an intake charge. Feel them as they are idling or running. Jan 4, 2004 · Some do the 4-7 swap so 5&7 do not compete for an intake charge. Jan 27, 2007 · The 4/7 swap Chevy IS the same as a 2/8 swap on a FORD and IS the old FLATHEAD firing order. With the swap 1-8-7-3-6-5-4-2. Lets take a look at what the two firing orders would be when compared. 7 out of a complete 1990 Silverado . The ONLY time firing order really helps power is if it helps scavenging, either in the intake manifold or the exhaust. 98 5. I don't know about that. 3 and 5. The 4/7 firing order SWAP configuration decreases crankshaft deflection, delivers a smoother torque curve, and aids acceleration. 505/. 7 rocker lsa. 7 vortec swap into Oct 17, 2020 · Okay so I have a 1994 Chevy k1500 with the 4. Chevy II 4 cyl. Open Dec 4, 2019 · Hello, I just ordered the 35810 Kit for my Camaro. 510/. 0 and 5. I did some research on this subject, this firing order is superior to the normal 18436572, the cylinders get a better charge of gas, run smoother, and run cooler also. Sep 3, 2008 · Ford firing order, 13726548 is the same as a chevrolet firing order with 2/3 7/4 swap 18726543. 242ex. My question is for the firing order. These racing cams Aug 13, 2022 · Summit Racing’s got a new series of Pro 4-7 Swap Hydraulic Flat Tappet Camshafts for the Small Block Chevy that’ll help you make the 4-7 switch. 495/. It’s also pointed out that swapping both cylinders 4 and 7 and cylinders 3 and 2 results in the firing order used in modern LS engines. So go back and argue about how much better it is to swap 4/7 and 2/3 plug wires. Stock 1-8-4-3-6-5-7-2. Feb 28, 2008 · A 7-4 swap will make more power but if this is a street car save your money. It's what GM discovered in testing and durability on the LS engine platform and that's what it is equipped with for good reason. Dec 16, 2015 · This 2. Firing-order shirts are at https://shop. davidfreiburger. I will try to focus on this a lot to get all the info out there you'll need. 1-6, 8-5, 4-7 or 3-2. Yet, I wouldn't bother with a 4/7 swap unless I was doing a over the top engine. Howards Cams, Steel Billet Mechanical Roller Camshaft, 4/7 Swap. But do think it has merit. Chevrolet 230 250 292 6cyl. I have personally done this myself. 540 Lift, 3200-7200 RPM Range, SB Chevy, Spark Plugs need Rerouted Summit Racing™ Pro SBC 4-7 Swap Camshafts In the first video of this series, we talk about budget building a 350 SBC using a stock GM bottom end. Feb 3, 2005 · These cams provide an exceptionally smooth torque curve and a significant decrease in crankshaft deflection. , 107 LSA + 1. Holley 750cfm vacuum carb 6" high "weiand team G style" singel plane intake 175cc heads, 70cc chambers, 10. Jul 22, 2009 · Simply swapping 2 & 3 (w/o 4 & 7) will result in the firing order of 1-8-4-2-6-5-7-3 with each bank’s cylinders firing all four cylinders before jumping to the other side. 875" roller bearing journals 50mm journals 55mm journals There's an extra charge $30 charge for these. 050, . The revised firing order increases power through better mixture distribution and smoother running through equalized crankshaft journal loading. It sounds very docile at idle, almost like it would make a 100 hp less that it does. Ando069. The 4/7 will allow more uniform cylinder temps and so will the 4/7 - 2/3. These 4 and 7 swap firing order cams feature a high-grade race quality core that changes the engine's firing order pattern to create more power Find COMP Cams Xtreme Energy 4&7 Swap Camshafts and get Free Shipping on Orders Over $109 at Summit Racing! Smart engine builders understand the benefits of a 4&7 firing order swap camshaft, which exchanges the 4 and 7 camshaft lobe timing in small and big block Chevy engines. Mar 25, 2010 · The 4. Some claim that the firing-order swap should not be used with a dual -plane intake, as the split-plenum arrangment is tuned for the conventional firing order. comCamshaft firing order swaps for Chevy engines that swap the order of the 4 and 7 cylinders are com In fact, he went so far as to say he'd actually lost a little power once when testing the 4/7 swap on a stock 350 Chevy. 661. Cam King - Mike Jones, Jones cam design. Jan 14, 2025 · Big Block Chevy 4-7 Swap. 7 engine & body to do this well deserved swap into my 89 Scotty COMP Cams Drag Race Mechanical Roller Camshaft 4/7 Swap Firing Order Lift . Will require a 90 degree 1/4" NPT fitting from the hardware store. should hopefully bolt up. 510 Lift, 2200-6400 RPM Range, SB Chevy, Spark Plugs need Rerouted Summit Racing™ Pro SBC 4-7 Swap Camshafts Sep 15, 2022 · As a performance engine builder, you’re looking for any way possible to pull more power from your engine. 3 in it, and th350 trans. obviously motor in this thread in this sub-forum in the entire site May 13, 2019 · It's nothing special it was claimed to increase hp by 1%. 7 in question is not a diesel. Small block Fords had different firing orders and someone said lets do this in a SBC. the reason to go with the 43/72 swap ( ls firing order ) is to reduce stress on the crank. Cylinders are numbered differently. 714" Duration 313/322 RPM Chevy 396-454ci Big Block 1965-96; 4&7 Swap Firing Order. Jun 20, 2012 · While really good information, hardly "new". WHAT If you have a 4-7 swap cam in it the intakes will open in this order #1,#8,#7,#3,#6,#5,#4,#2. 748"/. Ando069; Mar 21, 2025; Engine Performance + Maintenance; 2 3 4. 3 Chevy Scottsdale and I want to swap a 5. 615/. I have the 95 short step K1500 xcab with the 4. The newer style OBD2 case came standard in the ‘95’s with either the 4. Dec 27, 2022 · According to GM engineers, computer modeling showed that the new firing order improved reluctor wheel accuracy and eased bearing loads. Apr 9, 2025. Submit 06-17-16 11:24 PM - Post# 2634606 In response to adurbin11 Welcome to ChevyTalk. Virtually every engine family that uses the same 1-8-4-3-6-5-7-2 arrangement can gain from the swap. ---Bearing issues with 4&7 and 2&3 swap --- better bearing life moving the pairs that fire on the same pin to the back of the engine so the drivetrain can better handle the dampening of the forces. Jul 26, 2013 · I have the 4/7 and 3/2 swap in my big block Chevy. 3 currently running just fine. etc Just adjust each valve when the lifter is on the base circle. I never liked the proximity of 5-7 in the firing order, nor did Chevy, as they made the odd side wire loom separate the 5 and 7 wires to prevent cross firing. I know the 4. 7 V8 in 1996 to 1999 vehicles. I am running a strong 383 SBC with 200cc Aluminum heads, 10. When modifying the firing sequence for increased ride comfort, a popular swap is known as the 4/7 cam. It moves the major stresses of succesive firing across the same main cap to the rear of the engine which get oiled first. Some claim that the firing-order swap should not be used with a dual-plane intake, as the split-plenum arrangement is tuned for the conventional firing order. Oct 25, 2007 · With stock castings, I wouldn't expect to see any difference" In fact he went so far as to say he'd actually lost a little power once when testing the 4/7 swap on a stock 350 Chevy. 7 used the same setup. 5 Adv, . Available in tiers from Stage 1 to Stage 8, these 4-7 Swap Cams are perfect for virtually any SBC performance scenario, including mild street machines, aggressive dragstrip monsters, and seemingly Apr 25, 2017 · “The main reason people like the 4-7 swap or the 4-7/2-3 is really about cooling and torsion of the crankshaft,” explains Billy Godbold of Comp Cams. 1 day ago · Free Shipping - Summit Racing™ Pro SBC 4-7 Swap Cam and lifter kits with qualifying orders of $109. 236in. Then cam the 4/7 2/3 swap which is also used by all of the LS family. Would I be the first to do it, no. . The one big chip version was what I needed in my ‘95. They all sound the same at WOT May 5, 2016 · ---Hot spots solution with the 4&7 swap --- 5/7 hot spot problem moved to the front 4/2 which is a cooler spot. The original firing order of 1-8-4-3-6-5-7-2 is changed to 1-8-7-3-6-5-4-2 with this cam swap. O. Nickname. Chevrolet 200 229 90° V6; You're reviewing: Custom SB Chevrolet 4/7 Swap Camshaft. Extend the wire and put the knock sensor on the block next to the motor mount. This modification involves swapping the power stroke of cylinder 4 with cylinder 7 in the big block Chevy engine. 518 Lift, 2600-6600 RPM Range, SB Chevy, Spark Plugs need Rerouted Summit Racing™ Pro SBC 4-7 Swap Camshafts Summit Pro SBC Stage 5 Hydraulic Flat-Tappet 4/7 Firing Order Swap Cam, 236/242 Dur. Some engine builders believe this helps traction limited and/or restricted applications. I swapped the 98 5. Sep 26, 2006 · Memphis, TN--LUNATI, The Racer’s Company, is proud to announce the availability of their new line of 4/7 SWAP Camshafts for small and big block Chevrolet solid roller applications. 3 Vortec swap to a 5. They ARE exactly the same cylinder firing order. I think it is sales hype. 4 and a manual. $25 Off $250 / $50 Off $500, on Summit Racing Brand Products - Use Promo Code: BUILDIT Jan 3, 2012 · 4. I like it. When the ex starts to open, adjust the intake. By swaping they say that cylinder #5 will no longer steal intake charge from #7, but if you look, now cylinder #4 steals from #2. Jun 21, 2010 · For SB Chevy, we offer the 4/7-3/2 swap for roller cams w/ standard journals 1. CALL US. 6477. To me it is hocus pocus. Made in the USA from billet bearing steel and finished on Landis grinders, the cams have a 4/7 firing order (1-8-7-3-6-5-4-2). The most common for V8s are the 4/7 and Dec 11, 2006 · A 4/7-swap cam changes the engine's firing order, moving the power stroke for cylinder 4 to where 7 used to be, and vice versa. 7 vortec. The 5. Sep 26, 2007 · Listen to them run. Using a 4-7/2-3 LS swap camshaft for SBC still moves the pair of adjacent firing cylinders from the back to the front of the block, but to cylinders 3 and 1 instead of cylinders 4 and 2 like the 4 -7 swap cam. 4/7 puts the adjacent firing cylinders to be #2 & #4 Nov 21, 2011 · duration @. IIRC, going to a 4-7 swap Apr 2, 2018 · The only reason I did the swap is because my 1998 5. I dont see the point. Some claim maybe a 3-5hp gain on a fairly serious engine build. Flat-Tappet 4/7 Firing Order Swap Cam, 228/236 Dur. 630" Duration 288/296 Dec 26, 2010 · As far as your alternator problem, I would just use the serpentine setup off the 4. Feb 26, 2017 · But want to hear some other´s input on 4-7 swap fire order camshafts or even 4-7 3-2 swap, any experiences, input, tips? The engine im goin to get one for is a SBC 355cui. With any firing order for a V8 with a 90 degree crank, you fire both cylinders connected to the same throw, back to back, on 3 of the 4 You're reviewing: Custom BB Chevrolet 4/7 Swap Camshaft. FREE SHIPPING. The 351W & H. Jan 31, 2010 · I have a '86 C10 with a carbureted 4. 3 manual. This little trick can help balance out the engine’s vibrations. Nov 25, 2019 · Has anyone here had any experience with camshafts with the 4/7 firing order swap? How much power increase can they make? Can it be 30 HP difference, or more Dec 16, 2024 · A common modification, especially in older Chevy engines, is the 4/7 swap, where the firing order of cylinders 4 and 7 is reversed. 473/. I am planning to swap out the 4. On Web Orders Over $150. , 108 LSA + 2 Adv, . In theory there are some benefits over the typical LS swap. I have run one for years in my dragster and my car picked up with it. 7 vortec truck was totaled and my 95 had a 4. Customers have reported an increase in horsepower over traditional firing order cams. Therefore, a stock Chevy firing order of 1-8-4-3-6-5-7-2 Learn about a simple yet effective modification, the 4/7 lobe swap, and its impact on power output. It looks better, its more reliable and in your case would be easier, than using the old school v-belt setup. May 12, 2009 · The exact same way you adjust them on any engine. 8 to 1 compression, a 4-7 Swap camshaft in the 230* duration range. 6 Ratio, 2000-6200 Range Kit Item Quantity: 1 Summit Racing SUM-HT81716 - Summit Racing™ Hydraulic Lifters Re: 4/7 swap cams 07-20-04 07:41 PM - Post# 482153 In response to new2novas 1)The advantage is in the fuel distribution onto cylinder #2. E. 1 day ago · Summit Pro SBC Stage 4 Hydraulic Flat-Tappet 4/7 Firing Order Swap Cam, 228/236 Dur. Nov 19, 2010 · I was running a smaller duration cam 260/260 SR that had the standard firing order and went to a 264/270 SR with the 4/7 swap and the bigger cam idles smoother and isn't as choppy sounding. That is from the C Swap or 4/7 - 2/3 swap firing order. the 4 7 swap has nothing to do with itunless you use a method like "Bring number 1 to TDC then adjust intakes on these cylinders. The problem is that only two current sources can supply that 4/7 - 2/3 swap core and every cam core company out there can supply the 4/7 swap cores. So if you want to put together a more potent small Feb 21, 2024 · With a dozen grinds to choose from, Summit Racing Pro Big Block Chevy 4-7 Swap Hydraulic Roller Camshafts cover street performance, towing, and drag race applications. I can not see how the 4/7 will do this but maybe i guess. 495 Lift, 2000-6200 RPM Range, SB Chevy, Spark Plugs need Rerouted Summit Racing™ Pro SBC 4-7 Swap Camshafts Oct 23, 2007 · The main positive is the engine will run smoother with the C swap I. 533/. In the conventional firing order 5 and 7 pull fuel to the back of the engine and then 2 pulls to the front at the opposite end. 4/7 SWAP Camshafts also provide Feb 6, 2023 · Lots of info online. 3, the 4. COMP Cams Drag Race Mechanical Roller Camshaft 4 & 7 swap firing order Lift . Summary. 619. 639in . We saved money by staying out of the machine shop, an Chevy 262-400ci Small Block 1955-98; 4&7 Swap Firing Order . Is there a potential for the 4-7 Swap in the programming? I have downloaded the software on my phone to learn. Chevy Small Block 262-400, 257/263 @. 3 is basically a 350 with the front 2 cylinders chopped off and that my trans and motor mounts and front acc. David Freiburger explains what an engine's firing order is, describes companion cylinders, and shows how a camshaft can be used to swap firing orders. What do I need from the 5. The best one for durability is the new GM firing order. 50" lift w/1. You're going to have to add 4 wires into the injection harness, 2 for each extra I have had a few people doing conversions from 4. 7 engines were given the OBD1 style from the ‘94 trucks. Pro SBC Stage 4 Hyd. I'm planning exactly the same swap. While some builders have realized significant horsepower gains, all of them experience the exceptionally smooth torque Nov 30, 2007 · Here is the part that I dont understand with the 4-7 swap. 3 or the 7. Dec 12, 2008 · It's actually a 4-7, 2-3 swap where the traditional 302/289/260 1-5-4-2-6-3-7-8 order is identical to the GM/Chrysler/etc 1-8-4-3-6-5-7-2, as pointed out previously. The theory on the swap is to reduce harmonics. Shop Camshaft Kits at Summit Racing. First of all, you can USE your v6 engine harness to run the v8. 615 106: Chevrolet Small Block 262-400 May 6, 2020 · C3 Tech/Performance - 4/7 swap 2/3 swap . 5 Ratio, . Replies 38 Views 2K. 7 tbi what all do I need to get to do the swap. It’s like teaching your V8 to do a smooth waltz instead of the twist! How does the firing order for an old-school Chevy 350 compare to that of a modern LS engine? Jan 23, 2022 · I have a 1989 4. Find Summit Racing™ Pro SBC 4-7 Swap Camshafts and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing™ Pro SBC 4-7 Swap hydraulic flat tappet camshafts are American made and utilize ultra-modern lobe technology. The 4-7 swap, as you might guess, swaps cylinders 4 and 7. 495 1. xnepm uliqcd lxwrahq sebrei aars luiog mzn xgrphgp ysxji oxa