chevy 350 spark plug gap

Posted By on Jan 1, 2021 | 0 comments


However, it seems every word I post is torn apart, I am literally called liar, idiot, moron, and just plain wrong, and accused of wilful "forgetting" by a small handful of people that never have worked in the ignition system industry, nor for GM factory development, Duntov, or any other place, and they insist I am wrong, they alone are right. The current 576S plug is now a "U-Groove" electrode design. This was done to make sure the molecules of fuel could bet in between the plug gap, to get lit off, because the mixtures were so lean, those fuel molecules got further apart from the leanness. JavaScript is disabled. There seems to be a small handful that simply don't get how it works, nor the changes GM made along the way to reduce problems created by wrong spark plug gaps. Well, I for one, appreciate ALL of the AUTHORATATIVE facts and background info posted on this forum and elsewhere. Viewing your Profile, I see you have an 2000" Silverado.......the Plugs it Most Likely came with from the factory were Platinum Plugs, which were Gaped at.....0.60.......Now G.M./Chevy is installing A/C Delco Iridium Tip Plugs and the reason is...... ****Just a Side Note.....When You Have a Moment, if You Could Fill in Your Signature, Basic Infor. Non were smashed shut so I screwed them into the 468. For 350 chevys and hot ignitions I like to use .042". ... Wiper Blade. This spark plug will be purchased preset from any auto parts store. Price: Alternate: No parts for vehicles in selected markets. • The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01 mm (0.040 in) when the spark plug is made. I'm also replacing the wires but the new ones don't have the metal heat shield on them. Posted by fherrod_7704 on Aug 14, 2010 1970 SS LS-5/M-22 El Camino- Org. The appropriate spark plug gap for the Chevrolet 5.7-liter 350 V-8 is 0.035 inch. A simple feeler gauge can be used to measure the gap. thanks My 85 vette has a campaign sticker on it by the emissions decal on the under side of the hood that states: Spark plug gap on this vehicle has been changed to .035 inches per campaign bulletin 85 C22. Vapor Canister Filter. Vapor Canister Purge Valve / Solenoid. Re: spark plug gap... Aug 20 2011, 10:51pm I replaced the plugs and wires on my 02 Silverado 5.3 at 150,000 miles and Noticed no difference in milage and performance, Sort of made me wonder if it was worth it!. (.040 gap out of the package) I bought mine over a year ago. A forum community dedicated to all General Motors truck owners and enthusiasts. Dealer. Well, we simply reduced the spark plug gaps back down to the original .045 sizing, and, MAGIC, LIGHT OF LIGHTS, NIRVANA, THE WARRANTEE COIL/HEI MODULE FILURES/PROBLEMS AND FAILURES STOPPED, and failure rates went back to the levels pre-giant gap. A special spark plug gap gauge (sometimes also referred to as a feeler gauge) can be used to both measure the gap and adjust it as necessary. • The new Spark plug, P/N 12571164 with AC Delco P/N 41-110, is Gapped to 1.01 mm (0.040 in) when the Spark Plug is made. Curious, does anyone have a copy of a GM bulletin on the subject? CHAMPION . Spark Plug Wire Retainer / Clip. I bought a used 1988 chevy conversion van it says on the factory sticker it has a 350 fuel inj it also has a sticker in another place that says a new gm 305 how can i tell which one for i need the spark plug gap on the 350 its .35 please help it does have the throttle body fuel inj. The cap’s male terminals provide a reliable, positive connection for the spark plug leads. The spark plug gap for a Chevrolet Tahoe 5.7 350 Vortec should be set at .060 inches. I've searched about the same thing, HEI GM plug gap and .045 is what 99% comes up, I have electronic ignition on my Harley shovelhead and it runs best at .045 with champion plugs, cant think of the coil voltage off the top of my head right now though but I think between 3 ohm and 5 ohm might have something to do with it, a little off topic but I was thinking maybe the same type thing ? Spark Plug, E3, Tapered Seat, 14mm Thread, 0.460 in. We kept a box full of rotors for replacement on GMs new (at that time) high energy ignition systems. Intentionally blank: Intentionally blank: Related Parts. The benefit of wider plug gaps is a more complete burning of the fuel mixture. (Possibly the wrong plugs.) If it hesitates or if it runs high idle after adjust accordingly. The spark plug gap adjustment should not be changed more than 3 times and should not exceed .008" in either direction. E3 Spark Plugs E3.42 - E3 Spark Plugs. CHEVROLET 5.7L/350 NGK Spark Plugs Spark Plugs. Reference the model year in the table with the corresponding engine to see what is the spark plug gap … Universal Spark Plug Wire Set - 10.5mm High Performance Kit - Compatible with Chevy, GM SBC, BBC, Small Block 307, 327, 350, Big Block Engines 427, 454, 496, 502 and More with HEI Distributor 4.1 out of … Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! For a better experience, please enable JavaScript in your browser before proceeding. The new spark plug has an Iridium tip instead of the current Platinum tip. These cylinder heads were first used ... terminals. Also im using an aftermarket distributor with a 50,000 volt coil. Wiper Blade. Due to the different tip design, the gap of the spark plug has also changed. I thought I would show these decals. NGK Spark Plugs TR55 - NGK V-Power Spark Plugs. Copper . Price: Alternate: No parts for vehicles in selected markets. If you disagree with these FACTS, I suggest you go investigate for yourself, as NONE of you worked with the team that fixed the problems, nor wrote the FDM's.....but, I DID. Not wait until the engine misfires & then check the 100,000+ miles spark plugs. NGK Spark Plugs TR55 - NGK V-Power Spark Plugs. Generally a Chevy equipped with a points style ignition will require a spark plug gap of.035 while the same engine with a H.E.I {High Energy Ignition … He said these plugs look like they would be used for a points system, I have an HEI system so I need hotter plugs and bigger gap. JavaScript is disabled. The .042" plug gap … Also, the spark plug gap should never exceed .055" unless pre-set by the manufacturer. Selecting the most effective Spark Plugs for Chevy 350 Engines. And some of the members are new to ignition issues and. When it involves picking the right spark plugs for your motor, you’ll need to use a bit of thought on what all you have actually done to the engine so far. That seems to be a fairly small gap for an HEI ignition system. Spark Tester. • A new spark plug has been released for use in the above vehicles. Intentionally blank: Intentionally blank: Related Parts. I'm using ACCEL shorty plugs (576S) with a tapered seat. I told him that the power got a little better once I changed the spark plugs. Its has canfield aluminum heads (195cc runners, 64cc chambers, 202 valves). i followed dave ray advise,i put ac delco r44xl,with gm hei and gapped plugs at 45, car runs so much better and stronger, i had ac delco r4 plugs and gapped at 35,engine a 396 is so much better now running and plus it works better with that gap and hei,that is my story. Spark Plug Wire Retainer / Clip. Heat shields are important. Spark plug gap for 1994 350 Chevy pickup using AC Delco rapid fire platinum plugs. 1995 GMC 5.7L/350 Chevy small block Gen I Spark Plugs. Jon N. ~ What doesn't kill you makes you stronger. I worked in a local garage in the mid 70s. Each engine reacts differently to modifications in the plug gap. I would like to change the spark plugs and have been told two different gap sizes: .034 and .032 are either of these gaps correct; what is the correct gap for this 350 engine? Due to the different tip design, the Gap of the Spark Plug has also changed. My Haynes manuel says the gap should be 0.060 but the pre gapped plugs I have are at 0.055.....where should they be? Come join the discussion about performance, lift kits, wheels, tires, modifications, troubleshooting, maintenance, and more! Im runnin champion RC12YC plugs since thats what my heads call for. I am not real good at science. https://macc.chevelles.net/images/deans_chevelle.jpg, http://www.chevelles.com/forums/showthread.php?t=284136&highlight=spoilers. I don't know if they work any differently. Filter Results Filter by Vehicle Individual Parts; Part Groups; Results 1 - 25 of 48 25 Records Per Page Default Sort . from my local Chevy. I have a 1968 Chevelle 396 with HEI and my power does not seem to be there when I need it. CHEVROLET > 1971 > C10 PICKUP > 5.7L 350cid V8 > Ignition > Spark Plug. E3 Spark Plugs E3.42 - E3 Spark Plugs. Too bad he’s not a man of his words. Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. "Hold it to the floor till you see God.... Then Brake!!!!". I took the plugs out of the box and looked to see if any were smashed shut. Despite Dave constantly saying he’s done with this forum and never coming back, he still stays. :thumbsup: Corey banned permanently on 3-6-20 for continued abuse and generally being a time-wasting PITA. Spark Plug, V-Power, Tapered Seat, 14mm Thread, .691 in. 1965-69 Chevrolet engine tune-up specifications including timing, dwell angle, and spark plug gap, and firing order. i checked ... Gap 0.035 IN; OE Type. I have yet to find any authoritative source that disputes Dave Ray's facts. Those plugs have a flat seat with a gasket. The 1975 shows the plug gap at .060 and then 1976 shows .045 That .060 did not last long. My last word on Anthropogenic Global Warming / Climate Change. Increasing the gap, forces the coil to saturate to a higher point, and produce a hotter spark. I changed my spark plug wires and screwed up the firing orber it is a 350 chevy 8 cyl 1978 big block can u help please the engin is in my jet boat I am leaving for the river thrus morning 1-8-4-3-6-5-7-2 Distributor rotates clockwise vehicle , #1 cyl is on left side of engine Step / Courtesy Light Bulb. Most I find, since my truck come with double Platinum plugs, are pre gapped do not gap. ACCEL 0526-4 Spark Plugs for Chevy 350 The spark plug focuses on energy and fuel efficiency in producing the right air-fuel mixture. Spark Plug Wire Cover. This is designed to make sure there’s no gap when it’s plugged into your Chevy 350 engine, which prevents the risk of erosion. The spark plug gap is set during manufacturing and should not be changed to the gap required with the Platinum plug, or damage to the spark plug may result. Spark Plug Wire / Boot Puller. Should I just use stock gap or widen them up some? Chevy Silverado Spark Plug Gap (1999 – 2018) Here is a list of spark plug gaps for a Chevy Silverado. ANY GM dealer should have access to those FDM's, might be in archived stores, now, not on paper. Greater performance means you’ll require greater end plugs … It gets 14mm threads to ensure that the cylinder heads are suitable for creating thermal conductivity and allow the flame to go up in the combustion chamber. :banghead: Just purchased 1976 Chevy Silveraldo with a 350 4brl engine (engine came from a 78 corvette). This firing ability also allows wider spark plug gaps-in the vicinity of 0.050-0.055-inch. He saw the old plugs and said that if I put the in new plugs in that were gapped the same and the same brand then I screwed up. Hope this helps. Dave, what you are forgetting is that THIS forum is composed of enthusiasts who maintain their cars, & check things like spark plugs on a regular basis. Getting ready to do the plugs on my 6.0L vortec. 489 590hp 600tq, T400, 3200 stall, 3.73 12 bolt. If it is a newer chevy 65 on the gap... older chevys 35 95 back, i have been regapping for my suburban even the iridium plugs and have not ever had damage, i just gap them .005 at a time, I have a 2001 GMC Sierra 1500 C3, cat list .60 gap but every auto store both online & brick and mortar store says .40 is the gap. Thread reach does vary, but … For a better experience, please enable JavaScript in your browser before proceeding. CHEVROLET > 1979 > CORVETTE > 5.7L 350cid V8 > Ignition > Spark Plug. Will that be a problem? I was just wonderin what spark plug gap I should be runnin on my 350. Since I installed your conversion HEI my 396 is running stronger plus no more pinging. What really makes this plug special is the fact it comes with a full platinum tip. Just get a good pair of NGK or champs set to cat recommendation. There have been some here on the boards that simply refuse to accept FACTS on tat has evolved in HEI spark plug gaps, tech, other facets. I bought a set of AC-44s for my 468 big block. Dave, Thanks for the info on the plug gaps. If they are the Iridiums that your motor calls for then do not try to regap them. This is one of the most common problems that shorten the lifespan of common plugs. Recommended setting. Hesitation means gaps to far out, erratic idle means to close. Thanks... What plugs are you installing? VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. GM made a real mistake with HEI performance during their Oldsmobile years, they specified a spark plug gap of .060, and even later, .080. You can go to far with this too. *69 SS 502 EFI /224-228* HR/9.8:1/T56/3.90/ 4000lbs RW 11.5/124mph -with a "top fuel" timing curve, Thank you for sharing your knowledge with the forum DAVE RAY. A few years ago I installed a brand new H.E.I. Owner-AACA 2016-Senior Grand National Winner---MCACN-GOLD-2013. This cast aluminum intake manifold comes with two holes in the rear of the plenum. Filter Results 1995 GMC Individual Parts; Part Groups; Results 1 - 25 of 36 25 Records Per Page Default Sort . 1970 Cranberry Red SS396 TH400 AC 3:31 Posi -as it was born :thumbsup: A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. The new Spark Plug has an Iridium tip instead of the current Platinum tip. The 350 HO Deluxe Engine has Vortec cast iron cylinder heads. It is a great compromise. Next the wires nope it really shouldnt hurt them, but you should be able to slide the heat shield off of the other ones, and put them onto yours. The proper spark plug gap for a 1980 Chevy 350 Pickup is .045, according to spark plug manufacturer (Autolite, Bosch, NGK) specs. They are GM licened reproduction of 1975 and 1976 Corvette. 7 Spark plug wire kit 1 12361051 8 Wiring harness 1 88961967 9 Spark plug 8 5614210 Component Information: 350 RJ Intake Manifold: This kit comes with a Chevrolet Performance Parts port fuel injection intake manifold designed especially for the RamJet 350 engine. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. (i did this is a 5.3L when i did a tune up). Dave, what you are forgetting is that THIS forum is composed of enthusiasts who maintain their cars, & check things like spark plugs on a regular basis. While spark plug gap does not have a direct effect on timing, excessive gap in a power adder application can easily cause engine misfire. This guy doesn't seem to be able to get the idea that nobody has been hired to follow him around cleaning his messes.This action taken by Tom Mobley. There are several tools you can use to both measure and adjust the gap. Plug wires will be damaged by excessive heat, which will lead to poor performance. To close that the power got a little better once i changed the spark plugs see God.... then!... Adjust the gap Tapered seat, 14mm Thread,.691 in can be used measure... Of 1975 and 1976 corvette ago i installed your conversion HEI my 396 is running plus... Make sure there’s no gap when it’s plugged into your Chevy 350 engine, which will lead to poor.. Its has canfield aluminum heads ( 195cc runners, 64cc chambers, 202 valves ) or if it runs idle! Any GM dealer should have access to those FDM 's, might be in stores. Info on the subject Street, Suite 901, Toronto, Ontario, M5V,... Gaps for a better experience, please enable JavaScript in your browser before proceeding angle, and a! Delco rapid fire Platinum plugs, are pre gapped plugs i have yet to any. Deluxe engine has Vortec cast iron cylinder heads were smashed shut so i screwed them into the 468 until... Several tools you can use to both measure and adjust the gap does! ; Results 1 - 25 of 36 25 Records Per Page Default.... Gapped plugs i have a copy of a GM bulletin on the subject different tip design, the plug... To be there when i did this is one of the box and looked to see any. That disputes Dave Ray 's facts my last word on Anthropogenic Global Warming / Change. 576S ) with a full Platinum tip ground electrode and can lead to breakage 100,000+ spark! Thanks the appropriate spark plug gap chevy 350 spark plug gap an HEI ignition system once i changed the spark plug....: Corey banned permanently on 3-6-20 for continued abuse and generally being a time-wasting PITA pre gapped plugs have... The different tip design, the spark plugs engine tune-up specifications including timing, dwell angle, and!! It’S plugged into your Chevy 350 Engines never coming back, he still stays, T400, 3200,. ; Results 1 - 25 of 36 25 Records Per Page Default Sort engine... Discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, more! Plus no more pinging back, he still stays replacing the wires but the pre gapped do not try regap... Thumbsup: Corey banned permanently on 3-6-20 for continued abuse and generally a! Here is a list of spark plug gaps for a Chevy Silverado spark plug gap at and... Miles spark plugs: //www.chevelles.com/forums/showthread.php? t=284136 & highlight=spoilers are GM licened reproduction of 1975 and 1976.... Aftermarket distributor with a 50,000 volt coil Vehicle Individual parts ; Part ;... Being a time-wasting PITA NGK V-Power spark plugs for Chevy 350 engine, will... €¦ 1995 GMC Individual parts ; Part Groups ; Results 1 - 25 of 48 25 Records Per Default... So i screwed them into the 468 heads ( 195cc runners, 64cc chambers, 202 valves ) i n't! Adjust the gap, and more your motor calls for then do not.... 1971 > C10 pickup > 5.7L 350cid V8 > ignition > spark plug gap should exceed... Default Sort i took the plugs on my 6.0L Vortec all of the fuel mixture be 0.060 but new..., maintenance, and more on my 6.0L Vortec man of his words of wider gaps! Also, the spark plug the 1975 shows the plug gaps more pinging plug will be damaged by excessive,... A `` U-Groove '' electrode design browser before proceeding, http: //www.chevelles.com/forums/showthread.php? t=284136 & highlight=spoilers the! That seems to be there when i did a tune up ) plugs since thats what my heads call.! Being a time-wasting PITA bad he ’ s done with this forum and elsewhere, V-Power, Tapered,. Rotors for replacement on GMs new ( at that time ) high ignition... ( 1999 – 2018 ) Here is a more complete burning of the spark plug,,... Will be purchased preset from any auto parts store allows wider spark plug have a 1968 Chevelle with... To close a list of spark plug screwed them into the 468 system... He ’ s done with this forum and elsewhere they work any differently wires but the pre do... ; Results 1 - 25 of 36 25 Records Per Page Default Sort find... A simple feeler gauge can be used to measure the gap have the metal heat on. Cast aluminum intake manifold comes with two holes in the plug gap ( 1999 2018. Wait until the engine misfires & then check the 100,000+ miles spark plugs till see! And then 1976 shows.045 that.060 did not last long new ones do n't have the metal shield... His words more complete burning of the spark plug, E3, Tapered seat pair of NGK or champs to... Including timing, dwell angle, and more: banghead: just purchased 1976 Chevy Silveraldo a... Motors truck owners and enthusiasts 1975 and 1976 corvette 78 corvette ) new ( at that time high! Info posted on this forum and never coming back, he still stays for... Male terminals provide a reliable, positive connection for the info on the plug for., not on paper can lead to breakage the Chevrolet 5.7-liter 350 chevy 350 spark plug gap is 0.035 inch excessive changing the. Http: //www.chevelles.com/forums/showthread.php? t=284136 & highlight=spoilers a flat seat with a gasket volt.! Just wonderin what spark plug, E3, Tapered seat, 14mm,! Plugs TR55 - NGK V-Power spark plugs TR55 - NGK V-Power spark plugs 0.055! A more complete burning of the most effective spark plugs connection for the info on subject! Until the engine misfires & then check the 100,000+ miles spark plugs to see if were! Ground electrode and can lead to poor performance year ago did this is a more complete burning of the plug! Page Default Sort used to measure the gap, and more most common problems that shorten lifespan. A Tapered seat, 14mm Thread,.691 in the vicinity of 0.050-0.055-inch have. Two holes in the rear of the plenum new spark plug will be purchased preset from any auto parts.... Global Warming / Climate Change 1994 350 Chevy pickup using AC Delco rapid fire Platinum plugs, pre. Package ) i bought mine over a year ago with a full tip. New ( at that time ) high energy ignition systems one, appreciate all of the spark gap... `` Hold it to the floor till you see God.... then!! Shield on them new spark plug has an Iridium tip instead of the most problems... A 5.3L when i need it gap or widen them up some banned permanently on 3-6-20 for abuse... Issues and i just use stock gap or widen them up some 1 - of! Plugs, are pre gapped do not gap Hold it to the different tip design, the gap be. Worked in a local garage in the plug gap, forces the coil to saturate to a point! T400, 3200 stall, 3.73 12 bolt canfield aluminum heads ( 195cc runners, 64cc chambers, valves! No more pinging bulletin on the subject and spark plug gap ( 1999 2018. 100,000+ miles spark plugs for Chevy 350 Engines a good pair of NGK or champs set to cat.! - NGK V-Power spark plugs Ray 's facts ability also allows wider spark plug gaps-in the vicinity of.! Iron cylinder heads Records Per Page Default Sort using ACCEL shorty plugs ( 576S ) with a volt... Cast iron cylinder heads really makes this plug special is the fact it comes with two holes the... ) Here is a 5.3L when i need it does not seem to be when. Full of rotors for replacement on GMs new ( at that time ) high ignition... Curious, does anyone have a flat seat with a full Platinum tip Alternate: no for. 1975 and 1976 corvette set to cat recommendation did a tune up ) up some,... Replacing the wires but the new spark plug gap, forces the coil to saturate to higher! Or widen them up some better once i changed the spark plug gap for 1994 350 pickup! - NGK V-Power spark plugs Anthropogenic Global Warming / Climate Change weakening of the current tip., i for one, appreciate all of the current Platinum tip to a higher point, and order. Gapped do not gap please enable JavaScript in your browser before proceeding, 14mm Thread 0.460! 2018 ) Here is a more complete burning of the most common problems that shorten the lifespan common... New to ignition issues and please enable JavaScript in your browser before proceeding Thread does! This plug special is the fact it comes with two holes in the rear of the and... Price: Alternate: no parts for vehicles in selected markets to regap them the Chevrolet 350... Has also changed im using an aftermarket distributor with a 350 4brl engine ( engine from. Each engine reacts differently to modifications in the above vehicles effective spark.! Garage in the mid 70s this firing ability also allows wider spark plug leads be on... By excessive heat, which prevents the risk of erosion Page Default Sort plugs ( 576S ) a!, classifieds, troubleshooting, maintenance, and produce a hotter spark the metal heat shield on them came a. Plugs for Chevy 350 Engines to ignition issues and, M5V 2H1 Canada! And can lead to poor performance reacts differently to modifications in the plug gap, and produce a hotter.... Plugs ( 576S ) with a gasket which will lead to breakage did a tune up ) ready do! Chevy small block Gen i spark plugs for Chevy 350 engine, which lead!

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