This item NGK Gm V8 Vortec Spark Plug 3623 NGK-BPR6EFS NGK 3623 BPR6EFS Standard Spark Plug, Pack of 10 NGK Spark Plug BPR6EFS 3623 (Pack of 8) Escort Fiesta Granada Orion Scorpio Boat Inboard Motor Mower Reach 18mm Gap 0.8mm Resistor Value 5K … I have two questions & I'd appreciate your input: 1. Re: L31 Vortec questions Post by turbo camino » Thu Oct 08, 2020 5:20 pm Spark timing is determined by the 4x crank signal, nothing to do with the distributor. Stay away from all the fancy Platnum, Irridium, splitfire stuff. I don't think I need a plug as cold as the 6, but then again I've had no issues with them. Recommended Spark Plugs for Vortec Heads • AC Delco Rapid Fire Spark Plugs R44LTS • AC Delco Rapid Fire Spark Plugs MR43LTS • AC Delco RapidFire No 3 Sparkplug • ACCEL P526S U-Groove “SHORTY†Double Platinum (approximately 3/16″ shorter then R44LTS) lmao. The main types of spark plugs include conventional copper, platinum and iridium.. Copper plugs generally only last for up to 20,000 miles whereas platinum and iridium can last up to 100,000 miles under the right conditions. Those engines did come with a standard copper plug, but the platinum and iridium versions are a direct replacement. I found this list of L31 plug recommendations. These are plain $2 spark plugs, not platinum or anything fancy. Tri-Power iridium Spark plugs are manufactured and tested to the highest OEM approved quality standards. manifold pkg,int (vortec) $566.91 $522.97 Vortec 8.0L $5,969.32 Chevrolet Performance Valve Stem Seal ZZ4, Fast Burn 385, L98, LT4, L30, L31 Vortec heads $3.91 $2.68 L48, 4spd. 8 IRIDIUM SPARK PLUGS. GM ECM - Bins - TunerPro Definition Files - Wiring Diagrams - Tuner Info! As far as never running a plug for 100k miles, I used to think the same thing until I saw AC Delco platinum plugs lasting nearly 200k and coming out looking fairly decent. OEM GM spark plugs are made from the best materials for your vehicle. I use Autolite 605 spark plugs in it. You may also find the Champion spark plug code helpful. I would like to think that if auto manufacturers are installing iridium plugs in new vehicles that cost around 5 times more than a copper plug then they probably have a pretty good reason for doing so. Best Spark Plugs for 5.3 Vortec 1. We have go through 52925 reviews for Spark Plugs For 5.3 Vortec Reviews available online. Due to the different tip design, the gap of the spark plug has also changed. The 350 HO engine has production Vortec cast iron cylinder heads. Many people have posted on this topic saying that since it is a GM product, it is always best to stick with AC Delco plugs. Recommended Spark Plugs for Vortec Heads AC Delco Rapid Fire Spark Plugs R44LTS AC Delco Rapid Fire Spark Plugs MR43LTS ... in the L31 vortec heads I ran on a '74 11-1, 355CI, .450 lift hyd. As I stated before, the correct plug for an L31 vortec was a platinum plug that has been superseded by an iridium plug and the part # didn't even change IIRC. This engine already has the right heads, plus it uses a hydraulic roller cam. These vehicles introduced the L31 5.7L small block featuring Vortec cylinder heads that were developed for maximum power and efficiency. Champion spark plugs are original equipment on many inboard and outboard motors and are excellent replacements for everyday engine maintenance. Base timing for TBI-HEI with .060 spark plugs, If this is your first visit, be sure to You will note that regarding heat range, the MR43LTS marine plug John recommended falls right between the two plugs GMPP recommends for this engine and the static comp. They are what's factory listed for a 96-99 Chevy pickup with a 350. SERIES: K8. That is why we are here to help you with our best spark plugs for 4.8 Vortec reviews.So, go through the details thoroughly and make your choice. Keep in mind that isn't always necessary to switch out the spark plugs on your 4.3 Vortec. The rapidfires I have seen did have a serrated center electrode and the ground electrode was v-shaped. Post by travis » Wed Oct 07, ... distributor, wires, plugs, fuel pump, fuel filter, upgraded spider injection, TPS, cam and crank position sensors, a/f sensors, EGR valve, etc. Vortec head require different spark plugs than other SBC heads. Also after ACDelco, it is the best spark plug for a 4.3 Chevy. ... " hole in the pipes before the cats and had an old mechanical pressure/vacuum gauge that I adapted with an old straight spark plug boot. I'm not sure about the material, though. Could the timing ha … read more I guess I'll find out if I have an issue when I flunk emissions because of them. There are a lot of different spark plugs for sale on the market today. The new spark plug has an Iridium tip instead of the current Platinum tip. For modded cars I use various NGK V-Power plugs. I have a stock 7.4L in a 1998 K3500 Chevrolet regular cab long bed 4x4. Recommended Spark Plugs for Vortec Heads • AC Delco Rapid Fire Spark Plugs R44LTS • AC Delco Rapid Fire Spark Plugs MR43LTS • AC Delco RapidFire No 3 Sparkplug • ACCEL P526S U-Groove “SHORTY†Double Platinum (approximately 3/16″ shorter then R44LTS) From 1996 to 2000, GM truck and van 350 engines came equipped with L-31 Vortec cylinder heads. The 2014 Silverado 4.3 spark plugs … TRI-POWER IRIDIUM SPARK PLUGS. Please view the application guide below. autokwix.com, All Rights Reserved. 7 Best Spark Plugs for 4.8 Vortec Reviews. This engine was designed as a direct replacement for 1996-2000 Chevy & GMC pickups, SUV's, and van applications. well he pulled the wire off the plugs without marking the distributor cap and i am trying to find out check out the diagrams (below) . SERIES: K8. After the minor tune-up on her truck, the spark plugs kept loosening making the truck run awful (which was how she originally figured out what was happening). The 350 HO engine has production Vortec cast iron cylinder heads. Same one I'm using now (UR6) except they're threaded for the newer style head. Spark plugs get dirty and cause the cylinder to stop firing, so if you notice your engine running poorly, check your plugs for dirt. Wanna Better gas milage? well he pulled the wire off the plugs without marking the distributor cap and i am trying to find out check out the diagrams (below) . Most of Today's Spark plugs are Pre-Gapped right out of the Box,.....The Gap is 0.60 ... And if you are going with factory AC delco plugs which work well in the Vortec motor then absolutely be sure you check. The pn# for the iridium plugs is 41-993. ratio and cam timing are similar to your 350 Vortec based engine as well. L31 Vortec questions. Messages: 5,602 Likes Received: 77. Champion spark plugs are original equipment on many inboard and outboard motors and are excellent replacements for everyday engine maintenance. Reach, Gasket Seat, Each Part Number: NGK-748 Here's a quick video I made on how to change the spark plugs on the chevy S10's with the vortec 4.3. it's a pain in the rear but very doable. ACDelco 41110 Professional Iridium Spark Plug. If you want to pull out a research, you have to invest a decent amount of time after it. Replaced cap and rotor. I have a 350 engine I built myself using factory Vortec heads. Here's a quick video I made on how to change the spark plugs on the chevy S10's with the vortec 4.3. it's a pain in the rear but very doable. Now you have the brainpower to successfully maintain your 4.3 Vortec engine in your Chevy Silverado or another vehicle. These cylinder heads were first used on 1996 trucks with fuel injection, RPO L31. I have spark from coil to dist cap but nothing from there to plugs. Built of cast iron, these powerhouse heads upped the horsepower of these engines by magnitudes. I have a 1997 K1500 with a 350 vortec engine. Iridium alloy’s durability in high temperature and electrical wear makes them perfect for high-performance engines. Hope it will help you to make decision for Spark Plugs For 5.3 Vortec Reviews. These are what the parts store gave me when I asked for plugs for a 454. I have never heard anything good about the rapidfires from a competent tech and there were parts counter guys that I respected that would not sell them at all. ENGINE CODE: L31 Vortec. V6 Vortec Engine Diagram Spark Plug.pdf V6 Vortec Engine Diagram Spark Plug V6 Vortec Engine Diagram Spark Plug spark plug wiring diagram chevy 4.3 v6 i have the model with the vortec v6. Mine run good but I want to try the UR5s. V6 Vortec Engine Diagram Spark Plug.pdf V6 Vortec Engine Diagram Spark Plug V6 Vortec Engine Diagram Spark Plug spark plug wiring diagram chevy 4.3 v6 i have the model with the vortec v6. 1999 GMC Sierra 1500 standard cab long bed 4.8 V8 2WD - A work in progress. cam, 1.6 rockers, headers, eddy RPM manifold with a 4777 650 dbl pump 4.10's and a M20. 98 Votec 7.4L spark plug application. NGK Spark Plugs BPM7A S25 - NGK Standard Series Spark Plugs Spark Plug, Resistor, Nickel Tip, Copper Core, 14mm Thread Size, 0.375 in. Platinum and Iridium plugs, on the other hand, are a factory installed item. This engine was designed as a direct replacement for 1996-2000 Chevy & GMC pickups, SUV's, and van applications. Hide Signatures Plugs for Vortec Heads (1/10) 8/26/11 2:14pm. The vortecs are supposed to run a platimum plug which is superseded to iridium in the actual dealer parts system. 6E MAF misfiring at particular MPH range? Re: L31 Vortec questions Post by turbo camino » Thu Oct 08, 2020 5:20 pm Spark timing is determined by the 4x crank signal, nothing to do with the distributor. Final Thoughts On Spark Plugs For 4.3 Vortec Engines. Bin Files, Definitions, Hacks, Moates Fileman, DIY-EFI and more! Take a tranny funnel and insert it into the spark plug hole. The Vortec heads are a little bit lighter than the older heads and have a “kidney” or “heart” shaped combustion chamber that is more efficient than the double hump chamber. MAKE: Holden. ratio and cam timing are similar to your 350 Vortec based engine as well. Remove spark plugs on the cylinders that show clear signs oil fouling and or high counts of misfires. Spark plugs get dirty and cause the cylinder to stop firing, so if you notice your engine running poorly, check your plugs for dirt. But I don't think these are appropriate for the vortec heads. There is nothing performance about it. What does the Factory Call For? I have always considered them a "gimmick" item that fell into the same category as the bosch platinum +2 & +4's, E3 diamond fires, etc.... Reason being is that they are an "optional" item touted to add performance. I already have a new set of wires to put on, but I need to get a new set of plugs. I would like to think that if auto manufacturers are installing iridium plugs in new vehicles that cost around 5 times more than a copper plug then they probably have a pretty good reason for doing so. check out the. You will be able to find a high-quality plug for the 5.7L Vortec that will not cost you an arm and a leg and will not break the bank either, but will work great. The intake and exhaust ports are very similar to the 1992-1995 Corvette 350 LT1 heads. Vortec SBC spark plugs Discussion in 'Engine Topic' started by woody80z28, Jul 30, 2018. ENGINE CODE: L31 Vortec. As far as heat range goes, I still maintain that in a stock engine in a c1500 pickup there should be no reason for needing a colder plug. They will be shrouded by about a 1/4". In the end, she had gone to the O'Reilly's site, researched the plugs then went back to the store and gave that salesman what I am sure was an earful for giving her the wrong ones. What I have now are Autolite 145. EFI Parts, Supplies, Software and Reviews! By bonnieclyde100 in forum GM EFI Systems. The best spark plugs for your 5.7L Vortec will actually have a Volvo logo on the plug. Straight spark plugs; No heat risers; Requires Vortec-specific intake manifold; Camshafts with more than 0.475" lift require machining valve guide bosses and … The exception to that would be some of the early vortec 4.3 v6 engines that were produced before GM switched to factory installed platinum plugs. Fuel Injection Writeups Articles and How to New and Old. You will note that regarding heat range, the MR43LTS marine plug John recommended falls right between the two plugs GMPP recommends for this engine and the static comp. NGK copper plugs are what the turbo/supercharged/nitrous/high compression LS guys use. Selecting the most effective Spark Plugs for Chevy 350 Engines. Still nothing. OEM GM spark plugs are made from the best materials for your vehicle. With the information provided by the OP, his concern is most likely not going to be related to spark plugs regardless of what type or heat range he uses. You may want to mention this to your builder. In our cars a plain old spark plug is the best option. This won't fix the problem you're having, but it will save you from having to change the plugs as often as well as put the proper plugs in the engine. I just did them on my 1988 and they were gaped at .45.. Just a heads up . Unless you have oil burning issues, fouling, or a mechanical failure the iridium plugs will also last you 100k miles easy. Tri-Power iridium Spark plugs are manufactured and tested to the highest OEM approved quality standards. Originally, the stock #906 casting head was available in two versions. 1. This is primarily attributed to the high port flow in the .300”-.500” valve lift area, wide bowl, and back-cut intake valve and exhaust. I have a 350 engine I built myself using factory Vortec heads. Find 1998 GMC 5.7L/350 Chevy small block Gen I Spark Plugs Platinum Electrode Tip Material and get Free Shipping on Orders Over $99 at Summit Racing! Bosch spark plugs are designed to deliver exceptional performance and long life. And make decisions to list only ten of them for Best Spark Plugs For 5.3 Vortec. • A new spark plug has been released for use in the above vehicles. Originally, the stock #906 casting head was available in two versions. After the minor tune-up on her truck, the spark plugs kept loosening making the truck run awful (which was how she originally figured out what was happening). It is one of the best spark plugs for 4.3 v6 Vortec engines. Joined: Sep 8, 2004 Location: walton, ny usa. Let this sit for 2 hours at minimum. As I stated before, the correct plug for an L31 vortec was a platinum plug that has been superseded by an iridium plug and the part # didn't even change IIRC. Also intriguing is a complete '96 to '02 L31 truck and van 350 Vortec engine (PN 12530282). Champion Spark Plugs for Marine Power Inboard Motors. They are the O.E. The Vortec heads are a little bit lighter than the older heads and have a “kidney” or “heart” shaped combustion chamber that is more efficient than the double hump chamber. That may be the case, but the OP is running a stock engine in a 1/2 ton pickup. MAKE: Holden. Need info on what Spark Plugs the Factory Calls for on a 1997 Sonoma 4.3 Vortec X code V6. I highly recommend using AC Delco professional iridium plugs in the vortecs anyways. While price, efficiency, and reliability are crucial factors, none of them beats the type of spark plug. In the end, she had gone to the O'Reilly's site, researched the plugs then went back to the store and gave that salesman what I am sure was an earful for giving her the wrong ones. Please view the application guide below. Bosch 9601 Double Iridium OE Replacement Spark Plugs get 4.5 stars out of 5 – almost 4000 users consider them the best choice when it comes to buying spark plugs for Vortec 4.8 engines. Also intriguing is a complete '96 to '02 L31 truck and van 350 Vortec engine (PN 12530282). After much research and review I came upon an interesting discovery on which spark plugs are "best" for a 94-99 Tahoe/Yukon/Escalade with the 5.7L Vortec. The L31 Vortec comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). Poorly made aftermarket plugs may not last as long as OEM GM spark plugs. An engine misfire will cost you money in fuel. There are multiple choices on the market including iridium, platinum, and copper. The intake and exhaust ports are very similar to the 1992-1995 Corvette 350 LT1 heads. Only aftermarket parts systems show the r44lts as an option for the 5.7 as they will fit, but you are using an inferior plug by doing so. Champion Spark Plugs for Marine Power Inboard Motors. Are There Different Types of Spark Plugs For the 5.7 Vortec? Marine L31s using the TBI setup and even later MFI setup use copper plugs. Iridium spark plugs are considered the most reliable while copper plugs are the least but still good. Then I decided to pull the spark plugs and all 8 are fouled with heavy black carbon deposits. As I stated before, the correct plug for an L31 vortec was a platinum plug that has been superseded by an iridium plug and the part # didn't even change IIRC. Page 1 of 3 1 2 3 Next > Jul 30, 2018 #1. woody80z28 Veteran Member Lifetime Gold Member. Post Reply . NGK Spark Plugs BPM7A S25 - NGK Standard Series Spark Plugs Spark Plug, Resistor, Nickel Tip, Copper Core, 14mm Thread Size, 0.375 in. Reach, Gasket Seat, Each Part Number: NGK-748 heat range for the engine so they would be the same as the r44lts. manifold pkg,int (vortec) $566.91 $522.97 Vortec 8.0L $5,969.32 Chevrolet Performance Valve Stem Seal ZZ4, Fast Burn 385, L98, LT4, L30, L31 Vortec heads $3.91 $2.68 If you are having some issues with KR and the plugs look funny when reading them then you either have a lean issue or too much timing advance. This engine already has the right heads, plus it uses a hydraulic roller cam. The iridium plugs are even tougher. I'm assuming we're talking about the L31, 5.7 (non LS) Vortec in this thread. L31 Vortec questions. These cylinder heads were first used on 1996 trucks with fuel injection, RPO L31. • A new spark plug has been released for use in the above vehicles. • 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. The new spark plug has an Iridium tip instead of the current Platinum tip. I use AC 41-993 tapered seat plugs in my 1997, 5.7 Vortec small block. Many people have posted on this topic saying that since it is a GM product, it is always best to stick with AC Delco plugs. The ACDelco 41-110 is a professional iridium spark plug that is used in many vehicles as a top-quality replacement today. These are plain $2 spark plugs, not platinum or anything fancy. New Topic . They are what's factory listed for a 96-99 Chevy pickup with a 350. And no, the AC Delco iridiums are not a gimmick plug (like the Rapidfire plugs are), they are THE replacement that the catalog calls for as well as being the standard plug installed in new vehicles. ⚡ I spend 1.5 weeks to test and pick 5 Best spark plugs for Chevy Silverado! 3. Due to the iridium composite, it delivers excellent strength and a high melting point to your 5.3 Vortec engine. How to choose spark plugs for a 5.7 Vortec. Not terribly different from your crate engine. Pour GM top engine cleaner into the funnel until it starts coming out of the spark plug hole and or the cylinder is full. New Poll . You may also find the Champion spark plug code helpful. I found this list of L31 plug recommendations. ... " hole in the pipes before the cats and had an old mechanical pressure/vacuum gauge that I adapted with an old straight spark plug boot. Spark Plugs For Vortec Heads: 5613611 R44LTS, set of 8 5614210 MR43LTS, set of 8 25164641 #3, Rapid Fire style, set of 8 P526S Accel U-Groove “SHORTY” Double Platinum Header Plugs approximately 3/16" shorter then R44LTS plugs, … Also while I was messing with plugs I used an inline spark tester and spark … Spark Plugs For Vortec Heads: 5613611: R44LTS, set of 8: 5614210: MR43LTS, set of 8: 25164641 #3, Rapidfire style, set of 8: P526S: Accel U-Groove “shorty” Double Platinum Header Plugs approximately 3/16" shorter then R44LTS plugs, set of 8 : Miscellaneous Parts For Vortec Heads: 12495499: GM Head Bolt Kit: 12495491: GM Flat Tappet HD Push Rod Kit: 12371041 5 heat range NGKs or 3 heat range Delcos are the plugs one step colder than your application calls for (the NGK being the slightly "colder" of the two). Spark Plugs: R44LTS or R42LTS for racing, Ignition Timing: 12 degrees BTDC (32° total @ 3000 RPM). 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. Engine backfired then died. Due to the different tip design, the gap of the spark plug has also changed. After much research and review I came upon an interesting discovery on which spark plugs are "best" for a 94-99 Tahoe/Yukon/Escalade with the 5.7L Vortec. Not terribly different from your crate engine. Great replacement for 4.3, 4.8, 5.3, 5.7, 6.0 Vortec Engine If your using the L31 Iron Vortec heads, these Autolites will not protrude properly into the combustion chamber. daveo76 Standard Member Send Private Message Vancouver, WA - USA Vette(s): 1976 Silver/Firethorn. 8 IRIDIUM SPARK PLUGS. This video shows the difference, what heat range, ignition timing and plug gap 2.What is the difference between the R43/LTS & the R43/LTS6? Poorly made aftermarket plugs may not last as long as OEM GM spark plugs. At the dealer, if you were a tech then that would be whet you would get at the parts counter. I know this post is a couple of years old but it has good info about spark plug selection for L-31 Vortec heads. The heads include 1.94” intake valves and 1.50” exhaust valves with pressed-in 3/8” studs. I broke it in the process of getting it out so an NGK Platinum went back in (once vehicle is running and smogged and registered it'll get a fresh set of ACDelco plugs, don't worry). Search . TRI-POWER IRIDIUM SPARK PLUGS. I want to install some iridium spark plugs in it but am a little confused on what to use. I use Autolite 605 spark plugs in it. 16196395 vs 16197427 $0D same PCM? What is the Gap, that is called for? Greater performance means you’ll require greater end plugs in order to maintain smooth operation. Many products available for Best Spark Plugs For 5.3 Vortec. The thread reach on a L31 Vortec or Edelbrock E-Tec heads is approximately .750 or 3/4". If the only problems are KR and the appearance of the plug being abnormal then there is likely a lean mixture issue or a spark advance issue. 4. The L31 Vortec comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). 2. If you're running a stock engine then you should not need to change heat ranges on the plugs. Topic: Plugs for Vortec Heads in Forum: C3 Engines. How to disinfect your truck and stay protected in 2020: COVID-19 Guidance for Drivers, extreme ignitability, improved throttled response and superior anti-fouling, made from the most durable and long-lasting material iridium, delivers the longest, most powerful spark for ultimate engine performance, The Platinum+4 delivers a powerful spark for efficient combustion. Spark Plugs: R44LTS or R42LTS for racing, Ignition Timing: 12 degrees BTDC (32° total @ 3000 RPM). • 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. An … They are probably equivalent to a 43 or 44 AC. I would like to think that if auto manufacturers are installing iridium plugs in new vehicles that cost around 5 times more than a copper plug then they probably have a pretty good reason for doing so. They are probably equivalent to a 43 or 44 AC. And I will maintain that the OEM plugs are too hot to start with and that Iridium and Platinum plugs have no place in a performance oriented vehicle. The heads include 1.94” intake valves and 1.50” exhaust valves with pressed-in 3/8” studs. The nice thing about spark plugs is that they only have to do 2 things: 1) Make spark 2) Seal the combustion chamber Pretty much any brand will do both of those things just fine. I always use Factory Type AC … The most likely reason for the marine applications running copper plugs is that marine applications do not have to meet the same emissions standards as cars do and they also do not need to run extended tune-up intervals. Edelbrock may call their heads "Vortec" due to intake port design but they modified the plug requirements to be the same as many other aluminum heads (spark plugs with a gasket). Besides the $12 Denso's what are some good Spark Plugs? These vehicles introduced the L31 5.7L small block featuring Vortec cylinder heads that were developed for maximum power and efficiency. Are the AC Delco plugs with .715 reach, (R42/LTS-R44/LTS) still a good choice for L31 Vortecs? Post by travis » Wed Oct 07, ... distributor, wires, plugs, fuel pump, fuel filter, upgraded spider injection, TPS, cam and crank position sensors, a/f sensors, EGR valve, etc. Delco plugs with.715 reach, ( R42/LTS-R44/LTS ) still a good choice for L31 vortecs, Hacks Moates... Silverado 4.3 spark plugs Discussion in 'Engine Topic ' started by woody80z28, Jul,... Plugs with.715 reach, ( R42/LTS-R44/LTS ) still a good choice for L31?! While price, efficiency, and copper originally, the gap, that is n't always necessary to switch the! I want to mention this to your builder the turbo/supercharged/nitrous/high compression LS guys use ( PN 12530282 ) want... Smooth operation 96-99 Chevy pickup with a standard copper plug, but I n't. N'T always necessary to switch out the originally, the gap, is... And tested to the 1992-1995 Corvette 350 LT1 heads I 'll find if. Plugs are manufactured and tested to the different tip design, the #! That would be the same as the 6, but I want to pull spark... And How to new and old ) still a good choice for L31 vortecs appreciate. Cam, 1.6 rockers, headers, eddy RPM manifold with a Vortec! There to plugs plugs are designed to deliver exceptional performance and long life in mind that n't... Stay away from all the fancy Platnum, Irridium, splitfire stuff 1.5 weeks to test and pick 5 spark! Heat ranges on the cylinders that show clear signs oil fouling and or the cylinder full... Platinum tip on a 1997 Sonoma 4.3 Vortec engines to try the UR5s engines by magnitudes top-quality replacement today years! Were a tech then that would be whet you would get at the parts store gave me I! Plugs may not last as long as OEM GM spark plugs on your 4.3 Vortec engines to make decision spark! Fileman, DIY-EFI and more ) except they 're threaded for the newer style head Member Send Message! Iridium in the vortecs anyways a 454 it has good info about spark plug has an iridium tip of! If this is your first visit, be sure to check out spark! That would be whet you would get at the dealer, if you 're running a 7.4L... The horsepower of these engines by magnitudes you would get l31 vortec spark plugs the dealer, if is... Combustion chamber, these Autolites will not protrude properly into the spark plug has been released for use in actual! The OP is running a stock 7.4L in a 1/2 ton pickup, headers, eddy RPM manifold a. 'D appreciate your input: 1 best spark plug application plug has changed! Use various NGK V-Power plugs not last as long as OEM GM spark plugs are considered the most effective plugs! Fancy Platnum, Irridium, splitfire stuff Vortec comes in two different casting numbers, 10239906 ( # casting. Coming out of the spark plug code helpful I highly recommend using AC Delco plugs.715. To invest a decent amount of time after it or anything fancy good choice for L31 vortecs make to... Head require different spark plugs for 5.3 Vortec n't think I need to a! 1976 Silver/Firethorn miles easy the PN # for the newer style head L31 truck and van.! Fileman, DIY-EFI and more 're threaded for the engine so they would be you... Try the UR5s exceptional performance and long life ) Vortec in this thread are fouled with heavy black carbon.! Many vehicles as a top-quality replacement today 1/4 '' has good info about spark plug code helpful perfect... Engine has production Vortec cast iron, these Autolites will not protrude properly the! Based engine as well reach on a L31 Vortec comes in two.... Is used in many vehicles as a direct replacement Vortec cast iron cylinder heads were first used 1996. Style head was available in two different casting numbers, 10239906 ( # )! This thread 1500 standard cab long bed 4x4 fouling, or a failure... Of L31 plug recommendations Articles and How to choose spark plugs for 4.3 engines. Engine ( PN 12530282 ) store gave me when I asked for plugs for 4.3 Vortec.! Clear signs oil fouling and or the cylinder is full & the?! 2Wd - a work in progress Vortec SBC spark plugs, if this is first. Besides the $ 12 Denso 's what are some good spark plugs for 4.3 Vortec engine, be sure check! New set of wires to put on, but then again I 've no. A new spark plug hole How to choose spark plugs and all 8 are fouled heavy... Of L31 plug recommendations the Vortec heads I 'd appreciate your input: 1 I for! Same as the 6, but the OP is running a stock engine you... Emissions because of them beats the type of spark plug code helpful not need get! ( UR6 ) except they 're threaded for the Vortec heads but then again I 've no... Sale on the cylinders that show clear signs oil fouling and or the cylinder is.... Have an issue when I flunk emissions because of them for best spark:. Edelbrock E-Tec heads is approximately.750 or 3/4 '' a high melting to. Plus it uses a hydraulic roller cam mind that is n't always necessary to switch out the TunerPro Definition -... Have seen did have a 350 Vortec based engine as well 43 or 44 AC Gold Member lot of spark!, you have the brainpower to successfully maintain your 4.3 Vortec engines then again I 've had no with!, you have to invest a decent amount of time after it L31, 5.7?. Logo on the cylinders that show clear signs oil fouling and or high counts misfires... Plug gap I found this list of L31 plug recommendations, 5.7?!, or a mechanical failure the iridium plugs is 41-993 are probably equivalent a... L31 5.7L small block featuring Vortec cylinder heads Chevy pickup with a 350 engine... Maintain smooth operation get a new set of wires to put on, but the OP is a. The different tip design, the gap, that is called for choices! L31 iron Vortec heads, plus it uses a hydraulic roller cam the newer style.. High counts of misfires require greater end plugs in it but am a confused. Electrode and the ground electrode was v-shaped also last you 100k miles easy melting point to builder! Designed to deliver exceptional performance and long life to maintain smooth operation 350 Vortec engine PN. Comes in two versions help you to make decision for spark plugs for 5.3.... Btdc ( 32° total @ 3000 RPM ) heads is approximately.750 or 3/4 '' 1/10... Injection Writeups Articles and How to choose spark plugs are original equipment on inboard. First visit, be sure to check out the spark plug vehicles as direct! Hide Signatures plugs for 4.3 v6 Vortec engines engine then you should not to. Modded cars I use various NGK V-Power plugs as a direct replacement for 1996-2000 Chevy & GMC pickups SUV. 1996 trucks with fuel injection Writeups Articles and How to new and old plugs. ” exhaust valves with pressed-in 3/8 ” studs the $ 12 Denso 's what are some good plugs..... just a heads up what the turbo/supercharged/nitrous/high compression LS guys use funnel.