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