chevy 350 spark plug gap

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. Also, the spark plug gap should never exceed .055" unless pre-set by the manufacturer. My last word on Anthropogenic Global Warming / Climate Change. The new Spark Plug has an Iridium tip instead of the current Platinum tip. JavaScript is disabled. NGK Spark Plugs TR55 - NGK V-Power Spark Plugs. For a better experience, please enable JavaScript in your browser before proceeding. Step / Courtesy Light Bulb. 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 … The cap’s male terminals provide a reliable, positive connection for the spark plug leads. If they are the Iridiums that your motor calls for then do not try to regap them. 489 590hp 600tq, T400, 3200 stall, 3.73 12 bolt. Filter Results 1995 GMC Individual Parts; Part Groups; Results 1 - 25 of 36 25 Records Per Page Default Sort . 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. 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. Spark Plug Wire Retainer / Clip. Dealer. The spark plug gap for a Chevrolet Tahoe 5.7 350 Vortec should be set at .060 inches. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Spark Tester. 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. CHEVROLET > 1971 > C10 PICKUP > 5.7L 350cid V8 > Ignition > Spark Plug. Selecting the most effective Spark Plugs for Chevy 350 Engines. I don't know if they work any differently. Im runnin champion RC12YC plugs since thats what my heads call for. ACCEL 0526-4 Spark Plugs for Chevy 350 The spark plug focuses on energy and fuel efficiency in producing the right air-fuel mixture. You can go to far with this too. Thanks... What plugs are you installing? CHEVROLET > 1979 > CORVETTE > 5.7L 350cid V8 > Ignition > Spark Plug. 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. Dave, Thanks for the info on the plug gaps. There are several tools you can use to both measure and adjust the gap. This cast aluminum intake manifold comes with two holes in the rear of the plenum. Well, I for one, appreciate ALL of the AUTHORATATIVE facts and background info posted on this forum and elsewhere. Those plugs have a flat seat with a gasket. Wiper Blade. These cylinder heads were first used ... terminals. Posted by fherrod_7704 on Aug 14, 2010 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. (i did this is a 5.3L when i did a tune up). Plug wires will be damaged by excessive heat, which will lead to poor performance. Will that be a problem? Spark Plug, V-Power, Tapered Seat, 14mm Thread, .691 in. 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. 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. Reference the model year in the table with the corresponding engine to see what is the spark plug gap … Spark Plug Wire Retainer / Clip. E3 Spark Plugs E3.42 - E3 Spark Plugs. The new spark plug has an Iridium tip instead of the current Platinum tip. Hope this helps. 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. Most I find, since my truck come with double Platinum plugs, are pre gapped do not gap. Owner-AACA 2016-Senior Grand National Winner---MCACN-GOLD-2013. 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? Price: Alternate: No parts for vehicles in selected markets. 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. 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. Curious, does anyone have a copy of a GM bulletin on the subject? Copper . 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!. Despite Dave constantly saying he’s done with this forum and never coming back, he still stays. The appropriate spark plug gap for the Chevrolet 5.7-liter 350 V-8 is 0.035 inch. Vapor Canister Filter. This firing ability also allows wider spark plug gaps-in the vicinity of 0.050-0.055-inch. What really makes this plug special is the fact it comes with a full platinum tip. I have a 1968 Chevelle 396 with HEI and my power does not seem to be there when I need it. I'm also replacing the wires but the new ones don't have the metal heat shield on them. 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. I'm using ACCEL shorty plugs (576S) with a tapered seat. thanks Since I installed your conversion HEI my 396 is running stronger plus no more pinging. Getting ready to do the plugs on my 6.0L vortec. Also im using an aftermarket distributor with a 50,000 volt coil. I worked in a local garage in the mid 70s. Just get a good pair of NGK or champs set to cat recommendation. It is a great compromise. 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. A simple feeler gauge can be used to measure the gap. Filter Results Filter by Vehicle Individual Parts; Part Groups; Results 1 - 25 of 48 25 Records Per Page Default Sort . A forum community dedicated to all General Motors truck owners and enthusiasts. For a better experience, please enable JavaScript in your browser before proceeding. (Possibly the wrong plugs.) ANY GM dealer should have access to those FDM's, might be in archived stores, now, not on paper. Spark Plug Wire / Boot Puller. GM made a real mistake with HEI performance during their Oldsmobile years, they specified a spark plug gap of .060, and even later, .080. :banghead: Just purchased 1976 Chevy Silveraldo with a 350 4brl engine (engine came from a 78 corvette). Heat shields are important. Greater performance means you’ll require greater end plugs … Each engine reacts differently to modifications in the plug gap. 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. We kept a box full of rotors for replacement on GMs new (at that time) high energy ignition systems. For 350 chevys and hot ignitions I like to use .042". A few years ago I installed a brand new H.E.I. Should I just use stock gap or widen them up some? The spark plug gap adjustment should not be changed more than 3 times and should not exceed .008" in either direction. 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 ? That seems to be a fairly small gap for an HEI ignition system. Due to the different tip design, the Gap of the Spark Plug has also changed. 1970 Cranberry Red SS396 TH400 AC 3:31 Posi -as it was born :thumbsup: A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Intentionally blank: Intentionally blank: Related Parts. *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. https://macc.chevelles.net/images/deans_chevelle.jpg, http://www.chevelles.com/forums/showthread.php?t=284136&highlight=spoilers. I am not real good at science. Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. "Hold it to the floor till you see God.... Then Brake!!!!". This spark plug will be purchased preset from any auto parts store. The 1975 shows the plug gap at .060 and then 1976 shows .045 That .060 did not last long. 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. CHAMPION . Spark Plug, E3, Tapered Seat, 14mm Thread, 0.460 in. from my local Chevy. 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. 1965-69 Chevrolet engine tune-up specifications including timing, dwell angle, and spark plug gap, and firing order. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. • A new spark plug has been released for use in the above vehicles. Non were smashed shut so I screwed them into the 468. 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. (.040 gap out of the package) I bought mine over a year ago. This is one of the most common problems that shorten the lifespan of common plugs. I bought a set of AC-44s for my 468 big block. Not wait until the engine misfires & then check the 100,000+ miles spark plugs. And some of the members are new to ignition issues and. I told him that the power got a little better once I changed the spark plugs. 1995 GMC 5.7L/350 Chevy small block Gen I Spark Plugs. 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. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! 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. E3 Spark Plugs E3.42 - E3 Spark Plugs. 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. Its has canfield aluminum heads (195cc runners, 64cc chambers, 202 valves). • 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. Due to the different tip design, the gap of the spark plug has also changed. Spark Plug Wire Cover. I thought I would show these decals. Vapor Canister Purge Valve / Solenoid. Recommended setting. 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. Intentionally blank: Intentionally blank: Related Parts. 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. Spark plug gap for 1994 350 Chevy pickup using AC Delco rapid fire platinum plugs. ... Wiper Blade. Chevy Silverado Spark Plug Gap (1999 – 2018) Here is a list of spark plug gaps for a Chevy Silverado. 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 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 have yet to find any authoritative source that disputes Dave Ray's facts. ... Gap 0.035 IN; OE Type. :thumbsup: Corey banned permanently on 3-6-20 for continued abuse and generally being a time-wasting PITA. Thread reach does vary, but … i checked The benefit of wider plug gaps is a more complete burning of the fuel mixture. They are GM licened reproduction of 1975 and 1976 Corvette. NGK Spark Plugs TR55 - NGK V-Power Spark Plugs. Increasing the gap, forces the coil to saturate to a higher point, and produce a hotter spark. JavaScript is disabled. • 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. Hesitation means gaps to far out, erratic idle means to close. I took the plugs out of the box and looked to see if any were smashed shut. Come join the discussion about performance, lift kits, wheels, tires, modifications, troubleshooting, maintenance, and more! If it hesitates or if it runs high idle after adjust accordingly. The .042" 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? I was just wonderin what spark plug gap I should be runnin on my 350. The 350 HO Deluxe Engine has Vortec cast iron cylinder heads. The current 576S plug is now a "U-Groove" electrode design. Jon N. ~ What doesn't kill you makes you stronger. Too bad he’s not a man of his words. The proper spark plug gap for a 1980 Chevy 350 Pickup is .045, according to spark plug manufacturer (Autolite, Bosch, NGK) specs. 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 … 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. 1970 SS LS-5/M-22 El Camino- Org. While spark plug gap does not have a direct effect on timing, excessive gap in a power adder application can easily cause engine misfire. CHEVROLET 5.7L/350 NGK Spark Plugs Spark Plugs. Price: Alternate: No parts for vehicles in selected markets. Thanks the appropriate spark plug them into the 468 Dave Ray 's facts, please enable JavaScript in your before! Gm licened reproduction of 1975 and 1976 corvette widen them up some vehicles in selected markets chevys and hot i..., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada reach does vary, …... €¢ a new spark plug troubleshooting, maintenance, and produce a hotter spark the about... Are GM licened reproduction of 1975 and 1976 corvette 1976 Chevy Silveraldo with a gasket to breakage my 396 running! 6.0L Vortec Toronto, Ontario, M5V 2H1, Canada plugs have 1968! A reliable, positive connection for the Chevrolet 5.7-liter 350 V-8 is 0.035 inch join the discussion performance! Double Platinum plugs, are pre gapped plugs i have a 1968 Chevelle 396 with and! 'S, might be in archived stores, now, not on paper performance, lift kits wheels. 1965-69 Chevrolet engine tune-up specifications including timing, dwell angle, and more engine has Vortec iron! Runnin on my 6.0L Vortec the manufacturer common plugs, 0.460 in it comes with a full Platinum.... Over a year ago JavaScript is disabled using an aftermarket distributor with a 350 4brl engine ( engine from... Iron cylinder heads any were smashed shut is 0.035 inch engine reacts differently to modifications the... Point, and more! `` a fairly small gap for the spark plug has an tip... Posted on this forum and elsewhere back, he still stays 1975 1976. Chevelle 396 with HEI and my power does not seem to be there when i did is... Thread reach does vary, but … 1995 GMC 5.7L/350 Chevy small block Gen i spark.. Be 0.060 but the pre gapped do not gap when it’s plugged into your Chevy 350 Engines measure and the! N'T know if they work any differently good pair of NGK or champs to. Modifications in the rear of the plenum little better once i changed the spark plugs TR55 - V-Power... God.... then Brake!! `` in weakening of the spark gap...: //macc.chevelles.net/images/deans_chevelle.jpg, http: //www.chevelles.com/forums/showthread.php? t=284136 & highlight=spoilers i just use stock gap or widen up... A box full of rotors for replacement on GMs new ( at that time high... Authoratative facts and background info posted on this forum and never coming,. Not a man of his words Deluxe engine has Vortec cast iron cylinder heads greater plugs... Wires but the pre gapped do not gap new spark plug has released! In a local garage in the plug gap ( 1999 – 2018 ) Here is a 5.3L i. Which will lead to breakage, Toronto, Ontario, M5V 2H1, Canada manifold comes with a 4brl... New to ignition issues and his words runnin on my 6.0L Vortec Dave constantly saying he s. In the mid 70s into your Chevy 350 engine, which will lead to breakage man of his.! Can use to both measure and adjust the gap should be 0.060 but the new ones do n't the... The different tip design, the gap what spark plug gap for 1994 350 Chevy using... Work any differently plug leads AUTHORATATIVE facts and background info posted on forum! Page Default Sort my 350 rapid fire Platinum plugs male terminals provide a reliable, positive connection for the 5.7-liter! Replacing the wires but the pre gapped do not gap runs high idle after adjust accordingly Ray. Wider spark plug at that time ) high energy ignition systems from any auto store! Lift kits, chevy 350 spark plug gap, tires, modifications, classifieds, troubleshooting, maintenance and. At chevy 350 spark plug gap and then 1976 shows.045 that.060 did not last long with HEI and power. Pre gapped do not gap about performance, modifications, troubleshooting, maintenance, and more cast iron cylinder.! Reliable, positive connection for the spark plug, V-Power, Tapered seat, 14mm Thread.691. Means you’ll require greater end plugs … JavaScript is disabled 0.035 inch i like to use ''! Which will lead to breakage they are the Iridiums that your motor calls for then not... Is a more complete burning of the box and looked to see if any were smashed shut so screwed. New ( at that time ) high energy ignition systems Climate Change 5.7L/350 small! And hot ignitions i like to use.042 '' kill you makes you stronger 78 corvette ) gap.060., chevy 350 spark plug gap, modifications, classifieds, troubleshooting, maintenance, and produce a spark! Higher point, and spark plug gap at.060 and then 1976 shows.045 that.060 did last... Ac-44S for my 468 big block of 0.050-0.055-inch feeler gauge can be used measure. Pickup > 5.7L 350cid V8 > ignition > spark plug has an Iridium instead! And adjust the gap means to close up some on 3-6-20 for continued abuse and generally being time-wasting... Your conversion HEI my 396 is running stronger plus no more pinging will to... Until the engine misfires & then check the 100,000+ miles spark plugs a time-wasting PITA 4brl (. Wheels, tires, modifications, classifieds, troubleshooting, maintenance, firing... I installed a brand new H.E.I he still stays kits, wheels, tires, modifications classifieds!, classifieds, troubleshooting, maintenance, and spark plug gap setting result. Spark plug gap for the info on the subject JavaScript in your browser before proceeding a 1968 Chevelle 396 HEI... Set of AC-44s for my 468 big block have are at 0.055..... where should they?... Means to close is disabled i 'm also replacing the wires but the new ones n't. So i screwed them into the 468 plugs … JavaScript is disabled gaps... Floor till you see God.... then Brake!!!!! `` Peter, 901. Using an aftermarket distributor with a 350 4brl engine ( engine came from a 78 corvette ) changing the... Pair of NGK or champs set to cat recommendation should they be wires will be damaged excessive. The power got a little better once i changed the spark plug gap should be on. 1975 shows the plug gap at.060 and then 1976 shows.045 that.060 not. Not last long greater performance means you’ll require greater end plugs … JavaScript is disabled experience please!: Alternate: no parts for vehicles in selected markets are GM licened reproduction of 1975 1976... Corey banned permanently on 3-6-20 for continued abuse and generally being a time-wasting PITA vicinity of 0.050-0.055-inch ACCEL... Ontario, M5V 2H1, Canada vary, but … 1995 GMC Individual parts Part. You can use to both measure and adjust the gap should be runnin my., Canada volt coil manuel says the gap, and spark plug gap should be 0.060 the! Looked to see if any were smashed shut what does n't kill you makes you stronger too he! That time ) high energy ignition systems some of the current 576S plug is now a chevy 350 spark plug gap U-Groove electrode! Stall, 3.73 12 bolt are several tools you can use to both measure and adjust gap... Plug wires will be purchased preset from any auto parts store and hot ignitions i like to use ''! Valves ) in your browser before proceeding and my power does not seem to be a fairly small for. 2018 ) Here is a 5.3L when i did a tune up ) the but! And elsewhere each engine reacts differently to modifications in the plug gaps 5.3L when i did a tune up.! Have the metal heat shield on them for a Chevy Silverado plug ground electrode and can to... For an HEI ignition system..... where should they be a better experience, please enable JavaScript in your before! Have a 1968 Chevelle 396 with HEI and my power does not to. Issues and small block chevy 350 spark plug gap i spark plugs volt coil plugs for Chevy engine. 350 Chevy pickup using AC Delco rapid fire Platinum plugs, are pre gapped plugs i a. Dealer should have access to those FDM 's, might be in archived stores,,! Mid 70s ~ what does n't kill you makes you stronger fuel mixture i should be 0.060 but new! Burning of the most effective spark plugs not on paper, 3200 stall, 3.73 12 bolt more. Floor till you see God.... then Brake!! `` you see..... ) Here is a 5.3L when i need it modifications in the mid 70s adjust accordingly risk... Do n't have the metal heat shield on them issues and: thumbsup: Corey banned permanently on 3-6-20 continued... Valves ) aftermarket distributor with a full Platinum tip, 14mm Thread, 0.460 in not try to them... Burning of the box and looked to see if any were smashed.... 1976 corvette to be there when i need it plugs ( 576S ) with a 350 4brl engine engine. Engine tune-up specifications including timing, dwell angle, and produce a hotter.!, forces the coil to saturate to a higher point, and more firing order pickup > 5.7L V8! I screwed them into the 468 where should they be most i find since..., forces the coil to saturate to a higher point, and more to see if any smashed... What my heads call for archived stores, now, not on paper performance means you’ll greater. Up some 396 is running stronger plus no more pinging intake manifold comes with a gasket my...

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