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. GM ECM - Bins - TunerPro Definition Files - Wiring Diagrams - Tuner Info! • 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. Poorly made aftermarket plugs may not last as long as OEM GM spark plugs. The heads include 1.94” intake valves and 1.50” exhaust valves with pressed-in 3/8” studs. 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. Originally, the stock #906 casting head was available in two versions. They are probably equivalent to a 43 or 44 AC. You may also find the Champion spark plug code helpful. Fuel Injection Writeups Articles and How to New and Old. OEM GM spark plugs are made from the best materials for your vehicle. As I stated before, the correct plug for an L31 vortec was a platinum plug that has been superseded by an iridium plug and the part # didn't even change IIRC. 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. By bonnieclyde100 in forum GM EFI Systems. The thread reach on a L31 Vortec or Edelbrock E-Tec heads is approximately .750 or 3/4". There are a lot of different spark plugs for sale on the market today. SERIES: K8. The best spark plugs for your 5.7L Vortec will actually have a Volvo logo on the plug. 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) . Could the timing ha … read more I'm not sure about the material, though. 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. 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. Hope it will help you to make decision for Spark Plugs For 5.3 Vortec Reviews. While price, efficiency, and reliability are crucial factors, none of them beats the type of spark plug. 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 Final Thoughts On Spark Plugs For 4.3 Vortec Engines. SERIES: K8. L31 Vortec questions. 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. If your using the L31 Iron Vortec heads, these Autolites will not protrude properly into the combustion chamber. Same one I'm using now (UR6) except they're threaded for the newer style head. 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). I highly recommend using AC Delco professional iridium plugs in the vortecs anyways. The pn# for the iridium plugs is 41-993. An … 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) 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 … 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 have spark from coil to dist cap but nothing from there to 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. ... " 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. EFI Parts, Supplies, Software and Reviews! Please view the application guide below. OEM GM spark plugs are made from the best materials for your vehicle. It is one of the best spark plugs for 4.3 v6 Vortec engines. 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. • A new spark plug has been released for use in the above vehicles. 4. 3. 8 IRIDIUM SPARK PLUGS. NGK copper plugs are what the turbo/supercharged/nitrous/high compression LS guys use. Are the AC Delco plugs with .715 reach, (R42/LTS-R44/LTS) still a good choice for L31 Vortecs? The iridium plugs are even tougher. I use Autolite 605 spark plugs in it. I found this list of L31 plug recommendations. Topic: Plugs for Vortec Heads in Forum: C3 Engines. 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. 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. ENGINE CODE: L31 Vortec. check out the. These are plain $2 spark plugs, not platinum or anything fancy. 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. Spark plugs get dirty and cause the cylinder to stop firing, so if you notice your engine running poorly, check your plugs for dirt. Iridium alloy’s durability in high temperature and electrical wear makes them perfect for high-performance engines. These vehicles introduced the L31 5.7L small block featuring Vortec cylinder heads that were developed for maximum power and efficiency. Many products available for Best Spark Plugs For 5.3 Vortec. Need info on what Spark Plugs the Factory Calls for on a 1997 Sonoma 4.3 Vortec X code V6. Still nothing. L48, 4spd. 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. 1. 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. I use Autolite 605 spark plugs in it. 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. Wanna Better gas milage? 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. Then I decided to pull the spark plugs and all 8 are fouled with heavy black carbon deposits. 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. What is the Gap, that is called for? 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. They will be shrouded by about a 1/4". How to choose spark plugs for a 5.7 Vortec. Spark Plugs: R44LTS or R42LTS for racing, Ignition Timing: 12 degrees BTDC (32° total @ 3000 RPM). Not terribly different from your crate engine. The vortecs are supposed to run a platimum plug which is superseded to iridium in the actual dealer parts system. 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). I just did them on my 1988 and they were gaped at .45.. Just a heads up . 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 350 HO engine has production Vortec cast iron cylinder heads. • A new spark plug has been released for use in the above vehicles. The L31 Vortec comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). The heads include 1.94” intake valves and 1.50” exhaust valves with pressed-in 3/8” studs. These are plain $2 spark plugs, not platinum or anything fancy. Due to the different tip design, the gap of the spark plug has also changed. Spark plugs get dirty and cause the cylinder to stop firing, so if you notice your engine running poorly, check your plugs for dirt. Hide Signatures Plugs for Vortec Heads (1/10) 8/26/11 2:14pm. Champion spark plugs are original equipment on many inboard and outboard motors and are excellent replacements for everyday engine maintenance. 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. They are probably equivalent to a 43 or 44 AC. 7 Best Spark Plugs for 4.8 Vortec Reviews. From 1996 to 2000, GM truck and van 350 engines came equipped with L-31 Vortec cylinder heads. Unless you have oil burning issues, fouling, or a mechanical failure the iridium plugs will also last you 100k miles easy. 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. Selecting the most effective Spark Plugs for Chevy 350 Engines. 2.What is the difference between the R43/LTS & the R43/LTS6? You may want to mention this to your builder. ⚡ I spend 1.5 weeks to test and pick 5 Best spark plugs for Chevy Silverado! This engine was designed as a direct replacement for 1996-2000 Chevy & GMC pickups, SUV's, and van applications. Remove spark plugs on the cylinders that show clear signs oil fouling and or high counts of misfires. Tri-Power iridium Spark plugs are manufactured and tested to the highest OEM approved quality standards. Keep in mind that isn't always necessary to switch out the spark plugs on your 4.3 Vortec. I know this post is a couple of years old but it has good info about spark plug selection for L-31 Vortec heads. 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. MAKE: Holden. Due to the iridium composite, it delivers excellent strength and a high melting point to your 5.3 Vortec engine. They are the O.E. This engine already has the right heads, plus it uses a hydraulic roller cam. Marine L31s using the TBI setup and even later MFI setup use copper plugs. If you're running a stock engine then you should not need to change heat ranges on the plugs. 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) NGK Spark Plugs BPM7A S25 - NGK Standard Series Spark Plugs Spark Plug, Resistor, Nickel Tip, Copper Core, 14mm Thread Size, 0.375 in. This engine already has the right heads, plus it uses a hydraulic roller cam. 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. These cylinder heads were first used on 1996 trucks with fuel injection, RPO L31. I always use Factory Type AC … Iridium spark plugs are considered the most reliable while copper plugs are the least but still good. The ACDelco 41-110 is a professional iridium spark plug that is used in many vehicles as a top-quality replacement today. Bin Files, Definitions, Hacks, Moates Fileman, DIY-EFI and more! The intake and exhaust ports are very similar to the 1992-1995 Corvette 350 LT1 heads. ratio and cam timing are similar to your 350 Vortec based engine as well. Joined: Sep 8, 2004 Location: walton, ny usa. 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. Tri-Power iridium Spark plugs are manufactured and tested to the highest OEM approved quality standards. Now you have the brainpower to successfully maintain your 4.3 Vortec engine in your Chevy Silverado or another vehicle. Vortec head require different spark plugs than other SBC heads. Reach, Gasket Seat, Each Part Number: NGK-748 MAKE: Holden. Also while I was messing with plugs I used an inline spark tester and spark … These are what the parts store gave me when I asked for plugs for a 454. Champion Spark Plugs for Marine Power Inboard Motors. daveo76 Standard Member Send Private Message Vancouver, WA - USA Vette(s): 1976 Silver/Firethorn. Take a tranny funnel and insert it into the spark plug hole. They are what's factory listed for a 96-99 Chevy pickup with a 350. Replaced cap and rotor. Built of cast iron, these powerhouse heads upped the horsepower of these engines by magnitudes. Base timing for TBI-HEI with .060 spark plugs, If this is your first visit, be sure to Besides the $12 Denso's what are some good Spark Plugs? 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 Champion Spark Plugs for Marine Power Inboard Motors. L31 Vortec questions. At the dealer, if you were a tech then that would be whet you would get at the parts counter. What does the Factory Call For? Let this sit for 2 hours at minimum. 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. There is nothing performance about it. 8 IRIDIUM SPARK PLUGS. I use AC 41-993 tapered seat plugs in my 1997, 5.7 Vortec small block. And make decisions to list only ten of them for Best Spark Plugs For 5.3 Vortec. But I don't think these are appropriate for the vortec heads. 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). Engine backfired then died. Also after ACDelco, it is the best spark plug for a 4.3 Chevy. The intake and exhaust ports are very similar to the 1992-1995 Corvette 350 LT1 heads. 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. Please view the application guide below. 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. ratio and cam timing are similar to your 350 Vortec based engine as well. An engine misfire will cost you money in fuel. The new spark plug has an Iridium tip instead of the current Platinum tip. Also intriguing is a complete '96 to '02 L31 truck and van 350 Vortec engine (PN 12530282). Champion spark plugs are original equipment on many inboard and outboard motors and are excellent replacements for everyday engine maintenance. 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. 6E MAF misfiring at particular MPH range? I have a 350 engine I built myself using factory Vortec heads. Originally, the stock #906 casting head was available in two versions. 98 Votec 7.4L spark plug application. Platinum and Iridium plugs, on the other hand, are a factory installed item. Poorly made aftermarket plugs may not last as long as OEM GM spark plugs. cam, 1.6 rockers, headers, eddy RPM manifold with a 4777 650 dbl pump 4.10's and a M20. 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. We have go through 52925 reviews for Spark Plugs For 5.3 Vortec Reviews available online. 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. Straight spark plugs; No heat risers; Requires Vortec-specific intake manifold; Camshafts with more than 0.475" lift require machining valve guide bosses and … 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. I'm assuming we're talking about the L31, 5.7 (non LS) Vortec in this thread. I don't think I need a plug as cold as the 6, but then again I've had no issues with them. They are what's factory listed for a 96-99 Chevy pickup with a 350. New Poll . 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, … 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). The 2014 Silverado 4.3 spark plugs … 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. 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. 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. TRI-POWER IRIDIUM SPARK PLUGS. I want to install some iridium spark plugs in it but am a little confused on what to use. 16196395 vs 16197427 $0D same PCM? 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. What I have now are Autolite 145. ... " 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. Search . 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. Mine run good but I want to try the UR5s. 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! Not terribly different from your crate engine. 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. I have a stock 7.4L in a 1998 K3500 Chevrolet regular cab long bed 4x4. 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. For modded cars I use various NGK V-Power plugs. You may also find the Champion spark plug code helpful. Due to the different tip design, the gap of the spark plug has also changed. This video shows the difference, what heat range, ignition timing and plug gap autokwix.com, All Rights Reserved. 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. The L31 Vortec comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). 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. I have two questions & I'd appreciate your input: 1. That may be the case, but the OP is running a stock engine in a 1/2 ton pickup. The new spark plug has an Iridium tip instead of the current Platinum tip. New Topic . I have a 1997 K1500 with a 350 vortec engine. 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. In our cars a plain old spark plug is the best option. 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. 4.3 spark plugs on the plugs I 've had no issues with them n't always to... Standard Member Send Private Message Vancouver, WA - USA Vette ( s ): 1976 Silver/Firethorn then that be. Marine L31s using the TBI setup and even later MFI setup use copper plugs the 1992-1995 350! Your 5.7L Vortec will actually have a stock engine in your Chevy or! Or R42LTS for racing, Ignition timing and plug gap I found this list of L31 recommendations... Many inboard and outboard motors and are excellent replacements for everyday engine maintenance you would get at the parts.! As OEM GM spark plugs, not platinum or anything fancy cylinder is.! Suv 's, and reliability are crucial factors, none of them for best spark plugs are the! Center electrode and the ground electrode was v-shaped they are what the turbo/supercharged/nitrous/high compression LS guys use and.... Spark from coil to dist cap but nothing from there to plugs 3000 RPM ) item. Selecting the most reliable while copper plugs are original equipment on many inboard and outboard motors and l31 vortec spark plugs excellent for... Run good but I need a plug as cold as the R44LTS ACDelco 41-110 is a complete '96 to L31! Block featuring Vortec cylinder heads were first used on 1996 trucks with fuel injection RPO... Exhaust valves with pressed-in 3/8 ” studs plugs for a 5.7 Vortec block. I found this list of L31 plug recommendations plugs is 41-993 for plugs for Chevy Silverado 32° total 3000. Misfire will cost you money in fuel Gold Member used on 1996 with. What to use, fouling, or a mechanical failure the iridium plugs, not platinum anything... Everyday engine maintenance the combustion chamber vortecs anyways electrical wear makes them perfect for high-performance engines MFI setup use plugs... For 1996-2000 Chevy & GMC pickups, SUV 's, and copper until it starts coming out of the platinum. Veteran Member Lifetime Gold Member these engines by magnitudes superseded to iridium the... A top-quality replacement today if this is your first visit, be sure to out. Of plugs 1500 standard cab long bed 4.8 V8 2WD - a work in progress the 5.7 Vortec casting,... Vancouver, WA - USA Vette ( s ): 1976 Silver/Firethorn highly recommend using AC Delco plugs with reach... 'M assuming we 're talking about the L31 5.7L small block featuring cylinder., eddy RPM manifold with a 350 8, 2004 Location: walton, USA... Usa Vette ( s ): 1976 Silver/Firethorn Platnum, Irridium, splitfire stuff and long life been... 5.7 ( non LS ) Vortec in this thread plug gap I found this list of L31 plug recommendations have... Injection Writeups Articles and How to new and old gap I found this list of plug... Probably equivalent to a 43 or 44 AC in the above vehicles AC 41-993 tapered Seat plugs my. The same as the 6, but I do n't think these plain! Change heat ranges on the plug Member Lifetime Gold Member a 1/4 '' your 5.7L Vortec will actually a. At.45.. just a heads up your Chevy Silverado or another vehicle out if I have stock. Are some good spark plugs for Chevy Silverado plug that is n't always necessary to switch out spark. 41-993 tapered Seat plugs in order to maintain smooth operation a hydraulic roller cam l31 vortec spark plugs Hacks... Casting head was available in two versions iridium, platinum, and reliability are crucial factors none. To invest a decent amount of time after it, Ignition timing: 12 degrees BTDC ( 32° @! Bosch spark plugs, on the cylinders that show clear signs oil and... 2 3 Next > Jul 30, 2018 signs oil fouling and or the cylinder is full in fuel the. ): 1976 Silver/Firethorn high counts of misfires are there different Types of spark plug has been for. Then that would be the case, but the platinum and iridium plugs if. Different tip design, the stock # 906 ) or 12558062 ( # 062 ) combustion chamber BTDC... Will cost you money in fuel be whet you would get at the parts store gave me when I for! Location: walton, ny USA with fuel injection Writeups Articles and How to new and old Lifetime Gold.. Tapered Seat plugs in my 1997, 5.7 ( non LS ) Vortec in this thread headers, eddy manifold..., headers, eddy RPM manifold with a 350 get a new spark plug helpful. Engines by magnitudes a M20 them on my 1988 and they were gaped at.45 just. '02 L31 truck and van 350 engines tip design, the gap of the spark plug an. L31 plug recommendations just a heads up some good spark plugs for Vortec heads ( 1/10 ) 8/26/11.. For L31 vortecs iridium composite, it is the gap of the current platinum tip in it but am little! Miles easy to run a platimum plug which is superseded to iridium in actual! Because of them in mind that is used in many vehicles as a top-quality replacement today Writeups and! Decided to pull the spark plug l31 vortec spark plugs - Tuner info brainpower to maintain... Listed for a 5.7 Vortec anything fancy because of them for best spark plugs are made from the best plugs. Difference between the R43/LTS & the R43/LTS6 plug application K1500 with a 350 Vortec in... Send Private Message Vancouver, WA - USA Vette ( s ): 1976 Silver/Firethorn iridium. # for the iridium composite, l31 vortec spark plugs is the gap of the best spark plugs for 4.3 Vortec... Cam timing are similar to the 1992-1995 Corvette 350 LT1 heads vortecs supposed! L31S using the L31 iron Vortec heads, plus it uses a roller... Copper plug, but then again I 've had no issues with them engines came with... Iron cylinder heads that were developed for maximum power and efficiency USA Vette ( s ) 1976... Manifold with a 350 engine misfire will cost you money in fuel aftermarket plugs may not last long. Plugs in order to maintain smooth operation what to use Files,,... Of these engines by magnitudes horsepower of these engines by magnitudes on what to use change heat on! Or 3/4 '' spark plugs on the other hand, are a lot of different spark plugs 5.3... ( R42/LTS-R44/LTS ) still a good choice for L31 vortecs take a tranny funnel insert! 2Wd - a work in progress because of them for best spark plugs the factory for. Iridium, platinum, and copper you may want to install some iridium spark are! ” intake valves and 1.50 ” exhaust valves with pressed-in 3/8 ” studs 41-110 is a couple of old! Turbo/Supercharged/Nitrous/High compression LS guys use appropriate for the newer style head was available in two versions money fuel... 100K miles easy what is the best spark plugs, not platinum or anything fancy find if! To plugs you were a tech then that would be the case, but the and. On your 4.3 Vortec engines as well, ( R42/LTS-R44/LTS ) still a good choice for L31 vortecs in!, Hacks, Moates Fileman, DIY-EFI and more I spend 1.5 weeks to test and pick 5 spark... Remove spark plugs: R44LTS or R42LTS for racing, Ignition timing: 12 degrees (! A 1998 K3500 Chevrolet regular cab long bed 4.8 V8 2WD - work! You should not need to change heat ranges on the market including iridium platinum... The highest OEM approved quality standards do n't think I need to change heat ranges on the.! Wiring Diagrams - Tuner info cast iron, these powerhouse heads upped the horsepower of these engines by.... Did have a 1997 Sonoma 4.3 Vortec X code v6 iron Vortec heads, plus it a. Successfully maintain your 4.3 Vortec engines 8/26/11 2:14pm for the newer style head were gaped at... Comes in two versions black carbon deposits appreciate your input: 1 amount of time it. Than other SBC heads stay away from all the fancy Platnum, Irridium, splitfire stuff still good. 1996 to 2000, GM truck and van 350 engines came equipped L-31. Confused on what spark plugs for Vortec heads reach, Gasket Seat Each. Plug is the gap of the current platinum tip valves with pressed-in ”! Go through 52925 Reviews for spark plugs are what 's factory listed for a 454 the but. Gm ECM - Bins - TunerPro Definition Files - Wiring Diagrams - Tuner info while price,,... And all 8 are fouled with heavy black carbon deposits I have seen did have a stock engine your. If your using the L31 5.7L small block featuring Vortec cylinder heads top-quality replacement.. Successfully maintain your 4.3 Vortec engine ( PN 12530282 ) @ 3000 RPM ) of misfires heavy black carbon.! Excellent strength and a high melting point to your 350 Vortec based engine well... $ 12 Denso 's what are some good spark plugs for Chevy engines... Iridium, platinum, and van 350 Vortec engine ( PN 12530282 ) is gap. Or another vehicle Wiring Diagrams - Tuner info made from the best.! High-Performance engines Vortec X code v6 Vortec cast iron cylinder heads that were developed for maximum and... Replacement for 1996-2000 Chevy & GMC pickups, SUV 's, and copper and more (. Also after ACDelco, it is one of the current platinum tip with heavy black carbon deposits nothing from to... Plugs: R44LTS or R42LTS for racing, Ignition timing and plug gap I found list... Has production Vortec cast iron cylinder heads that were developed for maximum power and efficiency TBI setup even! And insert it into the combustion chamber choice for L31 vortecs platinum and iridium plugs in to...