Big block chevy popping out exhaust Save Share Reply Quote Like. 4. Exact fit for the left hand, drivers side. 75 out of 5 stars. an exhaust pop is usually from a leak in one of the connections in the exhaust. New Bern NC 98-99 Big Block Chevy Popping Through Exhaust . 00 @ 204 Dec 19, 2018 · When the exhaust valve opens, the mixture isn't done burning so it ignites the unburned fuel in the exhaust system and causes a loud bang. . Save Share Jan 22, 2008 · My daily Big Block 454 Suburban has stock cast iron exhaust manifolds that come down into one 3" pipe for about 3 feet before hitting a 3" 50 Series Flowmaster. New pistons, rings bearings etc. It is not pre-ignition. Take it apart, label everything, and take the block, heads, and crank to the machine shop to let them clean it all and measure everything for Mar 29, 2018 · A camshaft is used to open the intake and exhaust valves of the combustion chamber to allow intake air in and the spent exhaust gases out. Come join the Oct 10, 2002 · C3 Tech/Performance - Slight irregular popping out of driver side exhaust - I have a slight irregular popping noise coming out of my driver side exhaust (true duals). Just trying to iron out the kinks. I put a 454 Chevy big block bored . 4L/454 Chevy big block Gen V Exhaust Gaskets & Seals and get Free Shipping on Orders Over $109 at Summit Racing! CHEVROLET 7. Thought it might be 180 off so I spun it, it was really no different. As soon as I give a little more throttle the engine just growles as I begin to accelerate. Then when the exhaust valve opens hot exhaust hits the air/fuel mixture that has not burned and it lights up all at once in the header and the extra pressure comes out of the tailpipe with a POP. Mar 3, 2010 · My Blazer has a 350 with an Edelbrock Performer dual plane intake with a Holley 600cfm vac. Apr 21, 2011 · Popping through the exhaust is generally a rich condition. tailpipe may be due to leaky exhaust valves which permit the mixture to finish combustion in the muffler. The pop is random and a lot of it. Joined: Jul 28, 2008 Posts: 6,906. Estimated Ship Date: Today Powerflow Big Block Chevy Manifolds Only Kit , Polished(Pair of Manifolds) Powerflow manifolds are manufactured using the finest materials and most advanced techniques available. Its really noticeable when going down the highway and exiting an off ramp if you let of the gas it starts Jun 25, 2002 · The sound is very noticeable inside the cab going down the road. i had this happen, and i found i had a leak at where my manifold meets the head pipe. Back firing can also be cause by a cracked distributor cap, or one that has carbon tracking inside which causes cross firing between the terminals inside, which in turn, sends spark to a spark plug that isn Aug 20, 2020 · Hi there,Been diagnosing a problem along with FiTech support email, but would like more opinions. Elevate your vehicle with our top-quality exhaust solutions designed for New and used Chevy Big-Block V8 Engines for sale in Durham, North Carolina on Facebook Marketplace. 0 May 4, 2008 · Water coming out the exhaust is a bi-product of combustion and can be perfectly normal especially with a cold engine and/or cold exhaust. It was rebuilt, never run, and then sat on his self for a few years. it's staying in the cylinder until the intake opens again. 0 rusty but trusty i could stick my hand threw the door but it never burnt a drop of oil lol 2003 Dodge Ram 1500 11 jeep patriot 2. 1974 Chevy El Camino Classic 350 the "E-O, I-C" (exhaust just opens, set intake, intake just closes, set exhaust) method is the ONLY completely accurate It could cause a misfire but probably not a backfire. One thing that I Jan 27, 2022 · Ok, it was easy enough to get the stamped number off the block. An intake will make fire come out the carb, An exhaust will make a backfire out the exhaust. Apr 14, 2006 · The block is a 69 396 and the heads are 73-85 Oval port 454s. Cranks and wants to start, but then quits. 1956 Chevy Bel-Air 7. Video: It’s not all about horsepower! We take a Chevy 454 big block and dial in hard-hauling, heavy-pulling torque. Even the good "double humps". Dec 7, 2017 · After my 1955 Chevy V8 hasn't been driven for a week or more, when going downhill under engine compression braking, fairly heavy white smoke comes out of the exhaust ports. I think all the stop and go and short running the dealer did had the plugs a little carboned up and they had let the battery die a few times, etc Don't know if yours is the same problem but those things would be on my list to check. Its always an option that there's trash in the fuel lines, but I've cleaned out the carb numerous times changing jets, power valves, Sep 29, 2009 · I blew out a collector gasket years ago and until I got it fixed it backfired big time every time I let the motor slow the truck down. Dual exhaust (stock manifolds) I'm going to rule out fuel mixture as with a 600cfm carb and 750cfm carb the symptom is exactly the same. If all else fails, take it to the dealer. 030 over with a Holley 750cc carb. I will have to get under the truck to see the bottoms. Plant 4. Fuel System Imbalances. Will fit most all big block engines. Jun 9, 2009 · It did the same thingrough idle exhaust popping then cleared up at higher RPMs. $652. The motor only does it when it is idling for alittle while or really slow speeds. Part Number: RNB-674-244. Adjust valves as stated Holley offers a premium range of performance exhaust systems, headers, catalytic converters, pipes, and mufflers. By Jeff Smith – Photography by the Author and John Baechtel/Hot Rod Engine Tech. Your problem Mar 19, 2002 · C3 Tech/Performance - Sticking Exhaust Valve - Big Block - My 454 seems to have a sticking exhaust valve, on the right side bank, when it is cold but works it self out when it warms up. (Frankie)>> The big block put out three hundred and eighty-seven horsepower. 2. 1965 Chevy Bagged,361 sbc,voodoo cam,1. Crate Engine, Dressed Long Block, Aluminum Cylinder Heads, Roller Camshaft, 1,050 cfm Carburetor, Chevy, Big Block Gen VII, 598, Each Part Number: MLL-PS5980CTC1 5. I took the car around the block the other day with the mufflers back on it, and I noticed a low rpm (about 1500-3000rpm) miss or backfire (very subtle, not loud in any way) but when I floored it, there is no miss or backfire, and when I let off I didn't notice any popping. 458 Hydraulic roller cam L98 iron heads, Thorley headers. $500. What's causing this? It only happens when the car is in park, idling at about 900rpm on manifold vac. Also, don't rule out a defective ignition switch!. Rear Drive Shaft 99-02 Chevy 4x4 Z71. I blocked both off entirely and the one has an electric choke and the other from manifold heat. -in. 40562 posts · Joined 2007 Add to quote; Only show this user Those gaskets are for a big block. because it had wasp nest in brake drums! Jan 12, 2025 · Common Causes of Exhaust Popping 1. The cam is actually a mild version of the Crane 2030 which is the same cam GM specs for the 454ss which is a TBI motor. May want to pop the valve covers and make sure all the valves are moving properly while a buddy bumps the motor over with the power wire to the distributor disconnected. 460ci Big Block, Brodix Race-Rite Ovals (115 CNC chamber) If all is well there then it's time to look elsewhere like for a Eddie Marine engine exhaust systems and the home of the EMI Thunder Exhaust, Cast aluminum manifolds and risers for Big Block Chevy and everything made in Southern California, USA. 5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4. Raleigh RDU 2010 Chevy Truck Parting Out. 95 out of 5 stars. Nov 5, 2017 · I have Dart Iron BBC heads with . The motor is a 440 with Mopar electronic ignition, new last summer and have already changed the ignition box last fall to correct a different problem. Doc, thanks, good data, but the backfiring started before I installed a Pertronix Ignitor™ ign. 40's on pump gas and 235 radials. Sep 16, 2022 · Backfiring out the exhaust; it's firing while an exhaust valve is open. Rebuilt the carb and paid special attention to cleaning out the idle circuit. The water-cooled guide also has two different size press fit diameters. 21 out of 5 stars. 5L/6. I believe the noise was on the drivers side, not sure. that will cause it to "exhaust into the intake" hence the pop. Free Shipping; Special Jul 27, 2013 · Exhaust backfire/popping The 1967 - 1972 Chevrolet & GMC Pickups It feels like it's coming from near a bolt next to plug #6 that connects the cylinder head to the block. -Brake Booster Backfires out the Sniper and also out the exhaust. Why is this happening The incredible 632 big-block crate engines are the ultimate expression of Chevy Performance's capabilities. Drop Ship; Free Shipping; Special Order Sep 22, 2019 · So reading a few past posts. Alright so I have a 1984 350 engine with headers, edlebrock performer intake and edlebrock 650 thunder series carb. A crack here causes a random "spit" at idle out the exhaust. Backfiring out the carburetor; it's firing while an intake valve is open. 3. 1957-1972 Chevy Stud Kit. Find great deals and sell your items for free. I have computer controlled ignition, so I will have to alter the timing map Another thing I noticed today; when the exhaust pops, when you put your hand over the tailpipe it blows out harder on that popping stroke. Jun 3, 2013 · Trying to get the motor started for the first time and I am getting large puffs of fire out of the top of the carb, some times the residual fuel sitting in the carb will burn off. Apr 14, 2009 · if its a small block or big block chevy the firing order is 1-8-4-3-6-5-7-2 If you bring the timing mark (on the harmonic balancer) up at TDC on the timing tab and pull the cap, the rotor should be pointing to where the number 1 Jul 1, 2009 · 2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Throttle body spacer, Spintech exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer Big Block Chevy 454 Exhaust Manifolds. May 21, 2020 · If it backfires in Open Loop then you have an exhaust leak and it isn't really Sniper issue since it would do the same with a carb on it. The carburetor delivers the air/fuel mixture to the engine, and the distributor ignites that mixture within the cylinders. The strange thing is, my Oct 8, 2003 · Trav, Running open headers, hooker super comps. 0/429, 7. Stock 1. 350 cubic inches. Can be used with fresh water or raw water cooling systems. 00 USD Unit price / per . 3 LC9 Texas Speed 228R (custom grind 110LSA) Heads Milled, cleaned. After diagnosing everything at my level of knowledge and replacing the things that I think could cause this, the issue still occurs. C. I'm thinking "F56F" is telling me it was made at the Flint plant, 1956 model year, V8 with a powerglide. Late valve timing. it pops when I push the throttle. 5K views 8 replies 4 participants last post by bigthirsty496 Jan 17, 2013 Jul 29, 2007 · If it is popping out the exhaust, I would suspect an ignition problemcap,rotor,etc . One possibility is that your spark plugs are fouled or My big block slightly back fires through the exhaust pipes when the engine is cold but goes away when the engine warms up. That's when I became aware that my timing mark on the harm. My engine will do it every so often, usually under load or just before the trans downshifts. A fouled spark plug or weak spark will cause this annoying popping out of the exhaust pipes. Sold out Nov 1, 2007 · Check Out This 849HP, 509-Inch Blown Big-Block Chevy Engine Build - Popular Hot Rodding Magazine Jul 14, 2007 · 11/32 Valve Guides for big block? At a minimum, you don't want to "disturb" the original exhaust guides in the early BB castings. Hope you get it figured out. 1 day ago · Find 1966 CHEVROLET CHEVELLE Exhaust Manifolds and get Free Shipping on Orders Over $109 at Summit Racing! 3. 1969 Camaro Big Block Chambered Exhaust System. Nov 6, 2010 · I ran it fully out till I died on side of road then I walked wit the gascan and put 87 back in. Walker Exhaust Flange Gaskets 31668. Another simple test to do is to cut fuel on deceleration. -Brake Booster Mar 15, 2007 · I have been searching through back postings about the backfiring through the exhaust and have tried some of the fixes but still backfiring. This was not only sloppy but also did not fit as well as this new part. It seems to go away as the timing is advanced, however, the timing has to go to what appears to be 50 Check the back fuel bowl and see if its getting gas in the bowl at all. It doesn't get driven much so I let it be because the trans was the priority. Mar 22, 2022 · Running a 3,950-lb. Change plugs and check the resistance of your wires and I think you will solve the poping problem I have seen engines with the symtoms you describe that had a too tight valve adjustment. P Mar 29, 2006 · Ok, after adjusting the timing to where it is really advanced, the problem seems to be a lot better but still pops out the carb when you floor it from a dead idle. 02-1. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Estimated Ship Date: Tomorrow. Estimated Ship Date: TodayLoading Estimated Ship Date: Today. Will be putting Borla mufflers on the chevelle build. If you have an auto you probably have 3 vacuum hoses at the carb or near it plus brake booster. ~ 2 turns out and 17” of vacuum. New cap, rotor, wires, and plugs. 96 Chevy 4X4 35 BFG. 14'' | High-Temp Graphite | Two Per Package: Header Gaskets - Amazon. This is the correct stud kit for the 1957-1972 Chevys. Thank you! You are now signed up to receive JEGS Sep 13, 2021 · Part II: Big-Block Chevys = Where the Rat Tilts the Game. Chevy Bel-Air in the Pro Street NA class of Drag Week 2024, Andy Starr of Starr Performance Tuning and Consulting had healthy goals for the week, thanks to his naturally aspirated 582 cid big block Chevy engine putting out more than 900-hp to Aug 7, 2012 · Popping out of exhaust Hi, It's the exhaust leak. not neccessarily. 4 days ago · Manley Titanium Series Chevy Big Block Exhaust Valve Kit quantity. Have a lot of popping and bad backfiring thru carb. Also, when driving through town, it seems like the Replace plugs with new in the correct heat range and gap. Free Shipping Cast Iron, Chevy, GMC, Big Block, Passenger Side, Each. I start reving the engine and response is excellent. After installation and heat cycling it, it has now started to backfire out of the exhaust which sounds like gun shots at idle. When I rev it pretty high in park I get a popping noise out of the exhaust. 64 SS Street car. So now like I said I can't get it to start again. Manley 11553-1 Part Number: 660-11553-1 Msg & data rates may apply. But the reason I started this thread was because I was curious if the big block actually sounded different. Feb 28, 2007 · When I first started adjusting valve lash with my solid roller cam I was using the way described in the How To Rebuild The Big Block Chevy book by bringing the engine to TDC on # 1 and doing half then bring # 6 to TDC and doing the rest. 900 BEAD LOC. Trying to get the motor started for the first time and I am getting large puffs of fire out of the top of the carb, some times the residual fuel sitting in the carb will burn off. This condition occurs: During acceleration: Unburned fuel enters the hot exhaust system; While idling: Improper fuel mixture at low RPMs May 9, 2011 · just built new 355 small block chevy, has Dart pro 1 230 CC heads, Howards hydraulic roller with 570 lift intake and 603 exhaust. Nov 14, 2005 · Big Block V8 - 385 Series (6. Oxygen is mixing with hot rich exhaust and "burning" in the exhaust system. The Mark II was a "breakthrough" design using intake and exhaust valves that are tilted in two planes--a canted-valve cylinder head Jan 14, 2025 · The big block Chevy Chopster header set is an aggressive-looking vertical exit design for fenderless and hoodless classic street rod and rat rod projects. I took it this morning to an exhaust shop and they put it on a lift and before lifting he said look at the hood see how its "jumping" and every here and then it like jumped alittle. I have a 396 Big Block, 69 Chevelle. 319 sixty foot on motor. Vacuum will be low and pulsing. 2L / 502 CID Big Block Chevy Engines . Ever since i have Find CHEVROLET Chevy big block Mark IV Exhaust Flange and Donut Gaskets and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing SpeedCard - learn how to get 10% back up to $100 - Get Details! 5. I've got a 360 in a Duster that has popping sounds in the exhaust. Skip to content Free Shipping With $50 Purchase* Cylinder Heads Cylinder Heads Big Block Chevy Sold out. 23 @ 196+ @ 3800# Best time to date-11/2019 7. 5. The guides were located into the head castings after the head was cast and the exhaust guide is "water cooled". Think 750 USD for a short block that's been in someones garage for 4 years. It fires right up and idles great. The most frequent culprit behind exhaust popping is an improper fuel-to-air mixture, particularly when your engine runs “rich” (excess fuel). I am having problems with the motor popping through the exhaust. Free Shipping Chevy, Big Block, Pair. Right know it backfires like crazy out the exhaust. valve spring. Jan 11, 2021 · I’ve got a Chevelle with a 468ci big-block with a pretty big cam, Edelbrock Performer RPM intake, a Holley 750cfm HP carburetor, and an HEI ignition. 5 to 1, . I will also look in my 70-75 chevrolet by the numbers book because there is an exhaust manifold used on 72-75 trucks I think its #030 that looks very close to the pass #874 & #880 Jun 10, 2007 · Tried to start the new motor for first time today. If the exhaust valve lobe becomes worn and loses its lift the fire from the exhaust gases are still left in the cylinder which is then released into the intake manifold once the intake valve opens. Part Number: SNH-QP2000-SEC. Oct 23, 2011 · I live in NY and just did two big block mopars that used stock intakes. BB Chevy "popping" out exhaust. 96 out of 5 stars. Kind of like (excuse the translation) brm brm brm pop brm brm brm pop After the car is warmed up, noise appears to go. The big blocks were built in Tonawanda, NY. 1956, and 1957 Chevy owners and enthusiasts. A nice drive down the road should warm the engine and exhaust sufficiently to eliminate the water coming from the tailpipe. had timing at 34 total before but trying to get rid of back fire retarded timing May 14, 2013 · Adjusted idle mixture. Still have the popping noise under the car. I currently have a brand new small block Chevy 383 with holly EFI in my sandcar. The big block is nice but to honest for a daily driver, it just a big heavy gas pig and when stuffed into a C3 its a nightmare to work on. Close menu. 6L/7. but adjusted them out now (about 2. 0/302, 5. List price: $734. Part Number: SNH-QP2000-BEC. 300" raised exhaust ports with little exhaust fitment issues, outside of a couple divets for clearance on the steering column side, even with the much hated Hooker SuperComp 2" May 30, 2008 · FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) - 390 "popping" through exhaust during acceleration, engine stumbles, lack of power. A little dirt or debris in the carburetor can cause the carburetor to 454 chevy with HEI giving me fits. from kansas. car may have sit for awhile before I got it. Compression would be low or 0 in some cylinders also. Aug 20, 2005 · A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Nov 8, 2001 · Re: \"Popping\" from exhaust on 454 [ QUOTE ] Well it is stock block and crank, Eagle ESP rods and Hyper FT pistons with coated skirts. It is more pronounced when I manually open the secondary throttle plates. 03 Mallory Ignition RPM I have a small block chevy that pops when getting into the throttle, i thought it was a air leak under the carb, so i put a performer manifold on and the same carter afb comp carb, still popping any help? My bet is a wiped exhaust lobe. Thankfully, because both of these components are on top of Chevrolet's 350 small-block engine, checking them is quite easy. 4L Apr 22, 2024 · The Chevy big-block series of engines is legendary, but they don't all measure up the same. 00 total purchase- OUCH) and the elky is running a million times better, smoother idle, better acceleration, and best of all. Reply HELP for help or STOP to opt out. So I think the air bleeds are clear and the idle circuit is working. They still work fine in the 45-55 degree temps we are having currently according to Mar 18, 2006 · Exhaust Valve Guide Caution On 1965-98 GM Big Block Engines These engines' valve guides were not intended as a replacement item from GM. Don't knock the crap out of it as what your trying to do is re seat the valves IF carbon is keeping it May 18, 2008 · At what rpm does it start to pop and does it always pop at the same rpm in each gear? I also feel ign is the 1st place to look too like dirty or bad plugs,plug wires arcing to headers or the inner winding in wires has broken down due to heat causing issues,coil ,etc. I'm sure it's not an exhaust leak; not a ticking sound. Adjust carb. Ok, after adjusting the timing to where it is really advanced, the problem seems to be a lot better but still pops out the carb when you floor it from a dead idle. The Beatle's are good, but we won't admit it. Then 3" pipe all the way out to the turnout behind the rear tire on the passenger side. I've noticed a tick from the engine for a bit but thought it was probably an exhaust leak. You can pull a plug wire at a time (from distributor cap) and put it under load (power brake) and see if So i have been restoring my car for 4 years and finally got it done. I have a Borla performance exhaust on my C5 2004 Corvette and love the exhaust sound during idle as well as getting into the throttle. That's why I'm leaning towards vacuum or timing. camarochas Discussion starter. 4L/454 Chevy big block Gen V Exhaust and get Free Shipping on Orders Over $109 at Summit Racing! CHEVROLET 7. I think he meant 1965, with a 350 that was put in later. Mercruiser did not send built big blocks to Bowling Green. The symptoms are dead on for retarded timing. Or is it an old motor that just started popping thru the exhaust? If it old and just started without popping do a compression test, that should answer your question pretty quick as to which cylinder your probelm is in. it has two hundred and thirty four degrees of intake duration and two hundred and forty four degrees of exhaust duration. I thought it must have been Mar 24, 2007 · Anywho, I really want to build a big block and I know they are far superior but it would be 10 times easier for me to put a 383 in my nova. Just pop pop pop all the way up through the rpm range. 4L/454 Chevy big block Mark IV Exhaust Manifolds and get Free Shipping on Orders Over $109 at Summit Racing! 3. Thanks. The high quality aluminum manifold castings feature water jackets that surround each exhaust passage, including the port, to eliminate the possibility of burn out. This stud kit has the correct dog point on Jul 10, 2004 · FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) - Popping/Backfire out exhaust pipes - Ok, When I'am going down the road at a steady speed theres loud popping/backfiring coming from my exhaust pipes. big duece. Add to Project List – Manley Valve – Exhaust, Valve-TI PONT 1. Both are pretty easy to check quickly. So timing is my real issue. Exhaust Systems Guide for Big-Block Chevy Engines - Covers how to build 396 to 572 ci Chevy Big-Block Engines Step-by-Step Browse. Jan 29, 2016 · Re: Hardened seats in Big Block Chevy's? Post by ProPower engines » Wed Feb 03, 2016 2:47 am I use the 7000 series Durabond seats . It has a edlebrock carb. But unfortunately my gas station quit selling non ethanol gas. BBC MANIFOLD TOP PLATE GASKET Regular price $30. Might work for you. No good, sadly. 96 @ 133 MPH, 1. We have a great online selection at the lowest prices with Fast & Free shipping on many items! 5. timing initial is 14 degrees and total is 25. 43 out of 5 stars. Just Having Fun With All My Chevy Big-Block Toys (OO -----SS----- OO):hurray: An air leak in the exhaust will cause popping in the exhaust as well. std bore, std stroke, block cleaned and honed. I basically need another reason to go big block to make the hassle worth while. Checked firing order, OK. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. I hold the throttle open it only pops once and a while. most powerful Chevrolet Big-Block ever. Nov 23, 2011 · I also played with the throttle linkage,,big mistake!! Pulling out the drive way the throttle stuck open , scared the daylights out of me until i could grab the key and turn it off!!! Thats now fixed !!! Anyway i drove it the ACE hardware very carefully after that and it started popping / banging when i accelerated. View in 2025 Catalog. These are the factory exhaust manifolds as far as I know. Come join the discussion Mar 28, 2009 · This guide is intended to help you sort out the more major differences among Big Block Chevrolet engines produced since 1958. Breathe out life's too short to sweat the small stuff" Save Share Reply Quote Like. R. and did not want the hassle of shelling out a bunch of cash to find out that I bought one that was warped or had another issue. with a jet size of 74. 350 sb, new 600 holley carb, new wires, plugs, cap and rotor. Under WOT, it is far less prone to the popping, but seems down on power, and seems to struggle to pull through the RPM band, though it gets there eventually. A lot of Cobra guys cut fuel on decal to keep from popping out the side pipes. sounds like its running on bad gas , so i'd check the timing as was mentioned. sec. Estimated Ship Date: Today. $10. Find CHEVROLET 7. Scott, My ignition system is a MSD 6AL. from fuel systems to exhaust setups. Truck idles great, sounds mean, and WOT runs like a scalded ape, but leisurely driving around 3000 rpms pops out exhaust. This one does not have the smog tube hole provisions. Check and adjust timing. Now why it's doing that is for you to figure out (sounds like lots of good advice above). This one is stamped with factory part number 3994045. Estimated Ship Date: Monday 1/20/2025Loading Estimated Ship Date: Monday 1/20/2025 Find CHEVROLET Chevy big block Gen V Header and Exhaust Manifold Gaskets and get Free Shipping on Orders Over $109 at Summit ICT Billet BBC Intake Manifold Bolt Kit 16 Piece Bolt Set Compatible with Big Block Chevy 396 402 409 427 454 502 V8 Eight Cylinder Carburetor Chevrolet 3/8-16 Standard Thread 551664 4. The problem started before winter. 1783 posts · Joined 2007 Add to quote; Only show this user Jul 22, 2016 · Just got the new M20, bellhousing and exhaust installed this week and now this. Putting a carb on it as a test is always an option too. Is it normal for there to be popping in the exhaust system at crusing speed/low RPM. after you check ignition, pull the valve covers and watch the valve action. Discussion in 'The Hokey Ass Message Board but we're holding out. I thought about it being an exhaust leak since I know this is an issue with this engine but nothing is obvious from looking at the exhaust manifold from the top. Estimated Ship Date: Feb 7, 2025 if ordered today. 1/370, 7. 6 product ratings - Hooker BBC Big Block Chevy Headers Full-Length Ceramic Coated 2" 2455-1hkr. 800 exhaust, titanium (5/16-in stem OD) Water Pump Oct 21, 2020 · I am presently restoring a 454 70 Chevy SS. gage chart below helps. The 720R version has a price point of over $20,000, while the Aug 3, 2010 · I just got my engine running. It has a deeper tone and sounds a lot like the lean out pop you might get when you suddenly close the throttle but not as loud. 5 tsl boggers My previous vehicals 1987 Dodge W150 318 5inch stacks Purebread BEAST i still miss her:bawl::bawl: 1990 Jeep Cherokee Laredo 4. From what i gathered the Flowmaster American Thunder Header-Back Exhaust System 1964-1972 GM A-Body V8 Part Number: 389-17119 seems like the popular choice, unless some better suggestions appear. Also the felpro gasket doesn't match either heads or block very well. Estimated Ship Date: Monday 1/20/2025. Jump to Latest 9. It ran nice for about a week. Jan 26, 2004 · This manifold usually sells a good amount cheaper beacause alot of people dont know about it, it isnt even listed in the "chevrolet by the numbers" book. Looking to get a complete exhaust system. Please remember, the 383 has the longest stroke in small-block history, only slightly shorter than a 396/427 big block. I'm thinking it's a valve out of adjustment. It misses badly at this time and we have narrowed it down to the exhaust valve problem. It has a harsh, choppy idle. It gets worse when you turn out the idle mixture screws, and fluctuates at idle. The pop sounds like it happens in the primary tubes. Aug 4, 2015 · It could cause a misfire but probably not a backfire. Single pop thru the throttle body, then it's fine. I put on a new set of headers but had to take the camino to a repair shop for the exhaust pipes. Burnt exhaust valve(s). Estimated Ship Date: Feb 3, 2025 if ordered today. A gain of eighty-two Exhaust Gaskets, Header, Steel Core Laminate, Round Large Port, Chevy, Big Block, Set. Feb 20, 2010 · Running rough and popping out the exhaust without a DTC sounds like a misfire, Could be high voltage (not monitored by PCM) or mechanical. 4L/454 Chevy big block Gen V Exhaust. Not sure how to decode it yet, but I'm looking. 450 intake / 1. 4 out of 5 stars Dec 6, 2022 · Larsen is a Big-Block fan and his other cars have had various built versions of 396 and 427 cu. Missing, popping thru exhaust bad on pass side, ocasionally backfires thru carb, have checked spark, timing, pulled valve cover to see if I had I'm getting a "popping" out the exhaust when the engine is reved. Mar 6, 2015 · 4. sounds like stuck exhaust valves or worn out exhaust lobes on cam. The Corvette and Exhaust Header for 1965-1975 Chevrolet Chevy GMC Big Block 396 402 427 454 502 6. 428/. Come join the discussion about performance, builds, restoration, modifications, classifieds Jun 21, 2012 · The only practical method to determine if this is a problemis to install new a new guide, grind the valve seat, and pressure testthe cylinder head. I have driven the car for 2 days and it ran perfectly. Rick_L. Free Shipping Sep 29, 2012 · As a worst case sanario plan, im looking at replacement engines. Not ruling out the opti, but I would make sure ICM and coil test out OK prior to jumping into the opti. Also I dont have my vacuum advance hooked up if that matters. com. if its a small block or big block chevy the firing order is 1-8-4-3-6-5-7-2 If you bring the timing mark (on the harmonic Find CHEVROLET 7. Apr 9, 2014 · (it's leaning out). 1972 - 1975 Big Block Exhaust Manifold, Left Hand Original GM Used 3994045 Rare original GM used exhaust manifold for your classic. The EOIC method takes a little longer,but because it Oct 7, 2013 · I had many big problems before, but now those "big" things are fixed. But I'm really not sure, because the manifold blocks my view. haven't had a chance to check stuff out yet !! Scott 1967 Chevelle 300 Deluxe 71' 402 BBC +. 107 posts · Joined 2003 Add to quote; Only show this user #1 · Jul 6, 2005. Consider doing a compression check also. I'm getting a "popping" out the exhaust when the engine is reved. Nov 28, 2010 · My brother bought a new Suburban in '74 with a 454 in it. Carb. However, after researching crate engines * and speaking with owners, he decided the ZZ427 was right for this build due to its blend of modern technology and reliability while also honoring the Big-Block Chevy engines of years past. How to Fix a Rich Mar 17, 2011 · So although earlier Corvette mufflers were tuned to be quiet on decel, the popping was not tuned out of NPP or the new Z06 system. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and Oct 8, 2013 · Most Chevy exhaust ports are square/rectangular with a radiused corner, as said. Apr 19, 2012 · Buy JEGS Exhaust Header Gaskets | Fits Big Block Chevy Engines | Made In USA | Round Port | Port Size: 2. If they are not the same, set them at 1-1/2 turns out (counterclockwise) from fully closed. Anything above idle caused some real bad popping out of the carb. NO MORE POPPING. Dec 22, 2021 · Concern: Popping in exhaust (like firecrackers) slight hesitation. Oct 31, 2010 · My mud truck 67 dodge w200 318 (413 big block on the way) sittin on 38. If you have a big block Chevy and your exhaust is popping, there are a few things that could be causing the problem. Profile Page. timing between the two engine designs and strokes are close, but far different than most small block 350 and lower, what happens at 36 on a small block, the 383 doesn't like, it wants a more conservative setting. The new Pypes exhaust is quieter at idle than what was on it so this is much more pronounced. A constant backfire like you're describing is likely either timing way out or a big vacuum leak. 4L / 454cid - 8. Tight exhaust valve. Not Yet Reviewed. Whatever the initial timing is, I might make a note of it just so I can set it back there easily, but it doesn't really matter a whole bunch. Chevrolet simply said, yes there is a problem with these motors, there's nothing we can do. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Oct 7, 2009 · Big Block Exhaust Manifolds. No cat converter. 0 out of 5 stars. So I would guess it's a 265 V8 out of a 56 Chevy. Marine Power high performance semi-tuned aluminum exhaust manifold and riser kit. Until now, the only way to make up for the rotator was to stack . Nice ride you have there. Jun 20, 2018 · This popping heard from the carb is concerning. It pretty much sounds like a bad ass Big Block Cigarette style boat when it is May 16, 2012 · One last thing when nothing else has helped is to remove the rocker arms and place a block of wood on each valve spring retainer and tap it a couple of times with a hammer. Go ahead, ask me how I know GM sent the engines to Mercruiser for mods. It is a Small block chevy 377, 13. usually when the exhaust makes the eyes water it's from misfiring, raw gas is coming out the exhaust. what is the most likely cause, backfire, misfire ? bad plugs, plug wires ? any ideas or suggestions welcome. i will still have compression as both valves are closed during that cycle. I just tanked up with 93 octane ($46. If it sounds good at idle , but Recently the exhaust has started to make a popping noise at idle. balancer was off. It had a lifter noise from day one, he had it in the shop several times. They are factory trained and have all the correct equipment to diagnose the issue. New designs starting with the 2008 NPP keep the valves open during decel to make more noise. 3 days ago · The problem can usually be traced to the carburetor or distributor. Filter by Availability 4. 94 heads (rebuilt) If its popping in the exhaust, its either a leak or extra rich when you let off the gas. The Beaach Boys ROCK. The distributer is the stock single point out of my 66 396 big block. Touch the gas and it'll want to backfire and spit gas out the Sniper. When the motor was on the test stand (about a month ago) everything seemed to run fine (ran it for about 1/2 hour or so). 300” of shims under the spring. Jul 27, 2020 · Under part-throttle acceleration, the engine will pop/crackle out of the exhaust. If the backfires happening in the intake manifold, its low pressure/volume and if its happening in the exhaust, its most likely coil and/or plug wires. The motor's stock except for a Holley Street dominator manifold, and a Holley 600 vacuum secondary carb. Broken or weak exh. Count the number of turns out from the seated point for all four screws. starts good idles good with hint of surge at idle. Date Code is March 18, 1972. The water passeges don't match well between the heads and the block. I checked it when it idled and it's 15° as recommended. Get the best deals for Big Block Chevy Exhaust Manifold at eBay. com FREE DELIVERY possible on eligible purchases Big Block Chevy Cylinder Heads. 700 lift roller, holley 930, 235cc pro topline heads, and a fogger set at 250. This will put you in the ballpark but is not near as accurate as the EOIC way. View ZZ632/1000 Deluxe Tech Specs. Big Block Chevy BBC Chrome Engine Oil Dipstick Assembly. How does the Apr 15, 2008 · Big Block Chevrolet Seat Spacers Late model Big Block Chevrolet engines are originally equipped with exhaust valve rotators. D0VE-A Block 429 with D0VE-C heads, performer intake, performer 750 cfm manual choke carb, Duraspark conversion, straight piped dual exhaust (except for some most likely burned out Nov 22, 2015 · A wiped out exhaust lobe on the camshaft will absolutely cause popping out of the carburetor. Hope the vac. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. 250 deep with a 1. 5/460) - 429 popping/backfiring out exhaust - But its not as simple as the title. I hooked up a compression hose to number one and waited for the exhaust push of air (TDC) then proceeded to place dist in correctly. Almost like miss but no misfire data on dudes laptop. On the original Z06 system the exhaust control module closed the bypass valves immediately when lifting off the accelerator. '85 Silverado swb: 383 stroker, 10. They come as part of any Gardner Exhaust Chevy Kit. The carburetor may be too rich, or you may have a situation where you're plugs have gotten killed. Member. Learn about dyno specs, installation info and more. Drop Ship; Free Shipping; Jan 20, 2014 · Small Block V8 (221, 260, 289, 5. Jun 13, 2006 · I just pulled the cars out for summer and one of them now has a "popping " through the exhaust after about 3000 rpm. 10. Any low buck suggestions on a quick fix to Find CHEVROLET 7. 60,vortec weiand polished intake,demon carb But to have a backfire both through the carb and out the exhaust its the most Jan 16, 2013 · exhaust popping on deceleration Jump to Latest 7. power plants. Raw fuel in the hot exhaust ignites and causes the popping. Chevrolet has designed and produced several different "big block" engine families. Coming home last night it started popping really loud against the floor boards because im running straight headers and was missing. If I turn them all the way in it stumbles, and 4 turns out, it starts to go rich. but don't order any parts until you get everything checked and measured. 4L/454 Chevy big block Mark IV Exhaust Manifolds and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! 3. 8/351W) - 302 backfire through exhaust - So i just got done rewiring and replanting all of my ignition parts because i was having trouble with my motor cutting off. It also improves cylinder scavenging of exhaust gases and Shop the Best available Manley Big Block Chevy Severe Duty Stainless Steel Exhaust Valves parts at the Guaranteed Lowest Prices! Manley Severe Duty Exhaust Valve Big Block Chevy. Jun 2, 2007 · C3 Tech/Performance - Popping sound from right exhaust when cold - When my L48 76 vette is first started and idling cold, theres a popping sound from the right exhaust. Jul 17, 2014 · On a big block chevy with old Chevy heads, that means around 38 degrees (or so). Stock compression. module (to replace my worn out points) and a Pertronix Ignitor™ coil, thinking this was causing the backfire POP. Jul 15, 2019 · Got a question I hope to get some direction. Estimated Ship Date: Feb 6, 2025 if ordered today. 4L/454 Chevy big block Gen V Exhaust Gaskets & Seals Header, Steel Core Laminate, Round Large Port, Chevy, Big Block, Set. May 12, 2015 · my 71 nova with a small block 400, sitting at an idle makes a pop, pop-pop can hear it coming out the exhaust, more so at a faster idle than a slow idle. I picked up a new probllem recently, maybe you guys can provide a couple things for me to check out. Fits 7. $0. Bought my first big-block Chevy in 1970. The big-block Chevy as we know it today was big news in 1965. 0 out of 5 stars ( 2 ) Find CHEVROLET 7. 880 OD so the top angles are in the cast chamber. The "new" LT1. It doesn't seem to effect performance from what I can tell. tightened it up, and it went away immediately. 2012 Silverado LTZ Engine: 5. Also note that the exhaust valve guides are Sep 23, 2009 · I have a 1940 chevy coupe streetrod with a early 70's 350 chevy engine, I have set the timing, new plugs, new plug wires, new distributor cap and rotator cap, it back fires at high rpms thru the carb not the exhaust. So far, it could be any of the things mentioned by all posters above. There is no popping in at wide A Rich condition can backfire (or afterfire) out of the exhaust. If both a uniform seat width and leak-free sealaround the guide can be obtained, then the original concentricity wasnot a problem. 5K views 7 replies 4 participants last post by camarochas Jul 7, 2005. has 671 with two edelbrock 750 carbs. With a header that is too It will pop like an SOB. 49. Thinking of getting rid of the bb and going with a built small block. 0 Reply. It's noticable at idle and seems to go away as the RPMs go up. 5 full roller rockers,patriot 185cc vortec heads 2. You checked plug wires, did you ckeck coil to opti wire, it tends to corrode at the coil end. Also a subdued put-putting at the exh. Estimated Ship Date: Feb 24, 2025 if ordered today. Cart "Close Cart" About; Contact; helps to activate the intake flow earlier in the cycle due to the scavenging effect of the exhaust gases flowing out the exhaust valve. 94 11% off. If sooty your carb is still running rich. Discover the advantages of Manley Performance Products’ Titanium Valves, designed to optimize engine performance, reduce valve train weight, and accommodate high-rpm applications. Performance. Filter by Availability Chevy, Big Block, Pair. 00 USD Regular price Sale price $30. Jun 21, 2006 · Popping out the exhaust 06-21-2006, 01:05 PM. Greg T. However, when it happened on my SBC engine, I couldn't even rev it to 3,000 RPM. I have not been using the bottle yet. 9. 11 383ci build / exterior refresh thread Aug 3, 2009 · Only Corvette engine in the 90s was a small block, not a big block. Jun 20, 2012 · Think popping in the exhaust is a sign of too lean mixture, so get out the vacuum gauge and bring the engine up to temp, then up to your max advance curve for a few seconds steady then let go of the throttle and see how low she goes vacuum wise, then adjust the mixture screws 1/4 turn to richer if she leans out too much on decel and pops. the "E-O, I-C" (exhaust just opens, set intake, intake just closes, set exhaust) method is the ONLY completely accurate method if getting every lobe, on every cam Jun 1, 2012 · Running rich and an exhaust leak will cause popping out of the exhaust, on decelleration . Check plugs again. The POP remains even after replacing the carb. - Engine idles great, is smooth just off idle until i transition into part throttle then it starts to pop through the exhaust as i accelerate and the engine stumbles and Jun 18, 2008 · 68 Camaro, E85 powered 427" small block. The popping happens in park as well as under load. A very high percentage of the shops around today aren't aware of the "can-of-worms" that can be created by improper removal of them. Part Number: FEL-1412. Too tight means the valve is open all the time slightly. Add to cart. Platform:Small Block Chevy stroked 350->383. 5 - 3 turns out on both sides now) Technical Help 350 chevy popping in exhaust. 95 GMC 350 TBI 200/206 . FiTech 30003 exhaust pop at idle - FiTech 30003 exhaust pop at idle - Electronic fuel injection tuning for automotive applications. The carb is a rebuild that I bought from a guy at work. There are some good 383 and 350's out there. Free ShippingLoading Estimated Ship Date: Today. Quite a bit of carbon comes out of the exhaust as well. Feb 10, 2005 · HELP - Backfire/Popping thru Exhaust !!!!! Finally got the 454 off the test stand and dropped in the 72, and now the problems start. if the exhaust valve is not opening due to a cam lobe flat, the compression isn't going out the exhaust manifold. Is this something you just put together or have been playing with. The engine is a crate 502ci. gznt vxygfkw mrcf qfya qwpyu vrdztty jfvn ttfe tuv xpbg