L31 Vortec questions. Not terribly different from your crate engine. The intake and exhaust ports are very similar to the 1992-1995 Corvette 350 LT1 heads. 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. And make decisions to list only ten of them for Best Spark Plugs For 5.3 Vortec. Champion spark plugs are original equipment on many inboard and outboard motors and are excellent replacements for everyday engine maintenance. 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. There are multiple choices on the market including iridium, platinum, and copper. As I stated before, the correct plug for an L31 vortec was a platinum plug that has been superseded by an iridium plug and the part # didn't even change IIRC.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 have a 1997 K1500 with a 350 vortec engine. Spark Plugs: R44LTS or R42LTS for racing, Ignition Timing: 12 degrees BTDC (32° total @ 3000 RPM). Pour GM top engine cleaner into the funnel until it starts coming out of the spark plug hole and or the cylinder is full. These are plain $2 spark plugs, not platinum or anything fancy. 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. Hide Signatures Plugs for Vortec Heads (1/10) 8/26/11 2:14pm. 7 Best Spark Plugs for 4.8 Vortec Reviews. 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) . GM ECM - Bins - TunerPro Definition Files - Wiring Diagrams - Tuner Info! 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. 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. Originally, the stock #906 casting head was available in two versions. The 2014 Silverado 4.3 spark plugs … 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. I use AC 41-993 tapered seat plugs in my 1997, 5.7 Vortec small block. These are what the parts store gave me when I asked for plugs for a 454. This engine was designed as a direct replacement for 1996-2000 Chevy & GMC pickups, SUV's, and van applications. Not terribly different from your crate engine. 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. But I don't think these are appropriate for the vortec heads. Hope it will help you to make decision for Spark Plugs For 5.3 Vortec Reviews. These vehicles introduced the L31 5.7L small block featuring Vortec cylinder heads that were developed for maximum power and efficiency. Tri-Power iridium Spark plugs are manufactured and tested to the highest OEM approved quality standards. heat range for the engine so they would be the same as the r44lts. The iridium plugs are even tougher. An … Also intriguing is a complete '96 to '02 L31 truck and van 350 Vortec engine (PN 12530282). Built of cast iron, these powerhouse heads upped the horsepower of these engines by magnitudes. I'm assuming we're talking about the L31, 5.7 (non LS) Vortec in this thread. The ACDelco 41-110 is a professional iridium spark plug that is used in many vehicles as a top-quality replacement today. Spark plugs get dirty and cause the cylinder to stop firing, so if you notice your engine running poorly, check your plugs for dirt. Also intriguing is a complete '96 to '02 L31 truck and van 350 Vortec engine (PN 12530282). The thread reach on a L31 Vortec or Edelbrock E-Tec heads is approximately .750 or 3/4". 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. • 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. 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. L31 Vortec questions. The pn# for the iridium plugs is 41-993. I found this list of L31 plug recommendations. The L31 Vortec comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). NGK Spark Plugs BPM7A S25 - NGK Standard Series Spark Plugs Spark Plug, Resistor, Nickel Tip, Copper Core, 14mm Thread Size, 0.375 in. For modded cars I use various NGK V-Power plugs. Champion Spark Plugs for Marine Power Inboard Motors. What is the Gap, that is called for? 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. Base timing for TBI-HEI with .060 spark plugs, If this is your first visit, be sure to I already have a new set of wires to put on, but I need to get a new set of plugs. That may be the case, but the OP is running a stock engine in a 1/2 ton pickup. Still nothing. 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. Originally, the stock #906 casting head was available in two versions. Could the timing ha … read more Platinum and Iridium plugs, on the other hand, are a factory installed item. 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. 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. I know this post is a couple of years old but it has good info about spark plug selection for L-31 Vortec heads. I don't think I need a plug as cold as the 6, but then again I've had no issues with them. 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. 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. • 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. 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). cam, 1.6 rockers, headers, eddy RPM manifold with a 4777 650 dbl pump 4.10's and a M20. ENGINE CODE: L31 Vortec. Joined: Sep 8, 2004 Location: walton, ny usa. Spark plugs get dirty and cause the cylinder to stop firing, so if you notice your engine running poorly, check your plugs for dirt. Page 1 of 3 1 2 3 Next > Jul 30, 2018 #1. woody80z28 Veteran Member Lifetime Gold Member. Replaced cap and rotor. You may also find the Champion spark plug code helpful. They are probably equivalent to a 43 or 44 AC. Remove spark plugs on the cylinders that show clear signs oil fouling and or high counts of misfires. How to choose spark plugs for a 5.7 Vortec. This engine was designed as a direct replacement for 1996-2000 Chevy & GMC pickups, SUV's, and van applications. ⚡ I spend 1.5 weeks to test and pick 5 Best spark plugs for Chevy Silverado! 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. The 350 HO engine has production Vortec cast iron cylinder heads. 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. These vehicles introduced the L31 5.7L small block featuring Vortec cylinder heads that were developed for maximum power and efficiency. 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). Let this sit for 2 hours at minimum. Take a tranny funnel and insert it into the spark plug hole. 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 the O.E. What does the Factory Call For? Fuel Injection Writeups Articles and How to New and Old. 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. Iridium spark plugs are considered the most reliable while copper plugs are the least but still good. Best Spark Plugs for 5.3 Vortec 1. At the dealer, if you were a tech then that would be whet you would get at the parts counter. • A new spark plug has been released for use in the above vehicles. 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. 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. 6E MAF misfiring at particular MPH range? Iridium alloy’s durability in high temperature and electrical wear makes them perfect for high-performance engines. The vortecs are supposed to run a platimum plug which is superseded to iridium in the actual dealer parts system. These are plain $2 spark plugs, not platinum or anything fancy. ENGINE CODE: L31 Vortec. From 1996 to 2000, GM truck and van 350 engines came equipped with L-31 Vortec cylinder heads. 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, … This engine already has the right heads, plus it uses a hydraulic roller cam. 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 … Search . Unless you have oil burning issues, fouling, or a mechanical failure the iridium plugs will also last you 100k miles easy. These cylinder heads were first used on 1996 trucks with fuel injection, RPO L31. The heads include 1.94” intake valves and 1.50” exhaust valves with pressed-in 3/8” studs. There are a lot of different spark plugs for sale on the market today. Due to the different tip design, the gap of the spark plug has also changed. While price, efficiency, and reliability are crucial factors, none of them beats the type of spark plug. OEM GM spark plugs are made from the best materials for your vehicle. 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) Poorly made aftermarket plugs may not last as long as OEM GM spark plugs. 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. Engine backfired then died. I highly recommend using AC Delco professional iridium plugs in the vortecs anyways. 1999 GMC Sierra 1500 standard cab long bed 4.8 V8 2WD - A work in progress. New Poll . Stay away from all the fancy Platnum, Irridium, splitfire stuff. 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 while I was messing with plugs I used an inline spark tester and spark … 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. 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. Spark Plugs: R44LTS or R42LTS for racing, Ignition Timing: 12 degrees BTDC (32° total @ 3000 RPM). Final Thoughts On Spark Plugs For 4.3 Vortec Engines. 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