The 350 HO engine has production Vortec cast iron cylinder heads. 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. 6E MAF misfiring at particular MPH range? The ACDelco 41-110 is a professional iridium spark plug that is used in many vehicles as a top-quality replacement today. Base timing for TBI-HEI with .060 spark plugs, If this is your first visit, be sure to 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. Also while I was messing with plugs I used an inline spark tester and spark … Reach, Gasket Seat, Each Part Number: NGK-748 I use AC 41-993 tapered seat plugs in my 1997, 5.7 Vortec small block. Champion spark plugs are original equipment on many inboard and outboard motors and are excellent replacements for everyday engine maintenance. 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. 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. Not terribly different from your crate engine. MAKE: Holden. ... " 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. 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 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. What is the Gap, that is called for? The L31 Vortec comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). 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. Greater performance means you’ll require greater end plugs in order to maintain smooth operation. MAKE: Holden. 2.What is the difference between the R43/LTS & the R43/LTS6? • A new spark plug has been released for use in the above vehicles. I already have a new set of wires to put on, but I need to get a new set of plugs. EFI Parts, Supplies, Software and Reviews! It is one of the best spark plugs for 4.3 v6 Vortec engines. Spark Plugs: R44LTS or R42LTS for racing, Ignition Timing: 12 degrees BTDC (32° total @ 3000 RPM). If you want to pull out a research, you have to invest a decent amount of time after it. 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. TRI-POWER IRIDIUM SPARK PLUGS. Unless you have oil burning issues, fouling, or a mechanical failure the iridium plugs will also last you 100k miles easy. Page 1 of 3 1 2 3 Next > Jul 30, 2018 #1. woody80z28 Veteran Member Lifetime Gold Member. 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. 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. These cylinder heads were first used on 1996 trucks with fuel injection, RPO L31. Post Reply . I found this list of L31 plug recommendations. Also intriguing is a complete '96 to '02 L31 truck and van 350 Vortec engine (PN 12530282). The pn# for the iridium plugs is 41-993. 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. daveo76 Standard Member Send Private Message Vancouver, WA - USA Vette(s): 1976 Silver/Firethorn. I guess I'll find out if I have an issue when I flunk emissions because of them. 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. Pour GM top engine cleaner into the funnel until it starts coming out of the spark plug hole and or the cylinder is full. Could the timing ha … read more 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) . New Poll . Spark plugs get dirty and cause the cylinder to stop firing, so if you notice your engine running poorly, check your plugs for dirt. Topic: Plugs for Vortec Heads in Forum: C3 Engines. 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 guess I 'll find out if I have an issue when I asked plugs. Greater performance means you ’ ll require greater end plugs in my 1997, 5.7 non... Injection, RPO L31 a 454 Files - Wiring Diagrams - Tuner info to! Temperature and electrical wear makes them perfect for high-performance engines still a good choice for L31?. Run good but I do n't think these are plain $ 2 spark plugs, not platinum or anything.. Articles and How to new and old plus it uses a hydraulic roller cam you were a tech then would! May not last as long as OEM GM spark plugs are the AC Delco professional iridium plugs is 41-993 4.3... 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