I've noticed on the Intense site that they sell Autolite or NGK copper plugs to go with a smaller SC pulley. Why copper and not platinum? Can I use platinum? As soon as I get an answer I will be ordering Intenses 3.5 modular pulley system. Oh, and since I'm only getting the 3.5 pulley, do I need a smaller belt or larger tensioner? Do I also go one heat range cooler if I do need plugs? Thanks, Chris

Update: I order the Intense MPS with 3.5 pulley. Now I need to know if I should get a smaller belt, or larger tentioner? thanks..................

I believe it'* the higher compression that calls for copper. My stock SSEi runs alot better on copper. And a bonus is they are cheaper.

Always use copper plugs in a supercharged or Turbo application.

Techinfo is your friend.

http://www.bonnevilleclub.com/forum/...e=article&k=78

Autolite are even cheaper and they run just fine, 104s should be good

Stock plugs are platinum (some years) and work just fine and last a lot longer. For someone looking to squeeze everything they can out of their engine and trying to reduce KR they aren't the best idea, but for the people that drive theirs everyday its not a bad idea. We use them in the SSEi because it gets a lot of miles put on it, when you put that many miles on you don't want to have to worry about changing your plugs all the time. Especially since its my moms car and she doesn't do it herself, someone else (me) would have to do it for her and its just a hassle to get the schedules coordinated and whatnot especially with me living 190 miles away. We just went 1.5 ranges colder than stock with the platinums to help make up for them being platinum. The car still runs great, and gets no misfires (according to LS1M) and the plugs have ~96,000 miles on them right now, it also gets no KR even though it does have mods and whatnot. The plugs are due for a change obviously, but a copper plug wouldn't be doing that well.

But for most people on here that don't mind working on their cars all the time copper will help your car run better than platinum and they are a lot cheaper.

Also the GTP ran 12.5'* with platinum plugs and they didn't seem to cause KR any more than the 103'* we run now. The only reason we run 103'* is because we change the plugs twice a year anyways (before each MGM) and 103'* are a lot cheaper. Due to the low amount of miles we put on the GTP (like 8-10k a year) running copper plugs is no problem.

Shawn

If you want longevity out of the plug, I would suggest a Denso Iridium plug a few heat ranges cooler than stock. If your racing your car at the track, or adding mods, you will be pulling your plugs to re-gap and check for fouling or fueling problems anyway and copper is the best plug for a boosted application.

Thanks for all the help. I'll be getting NGK copper plugs. I just ordered the MPS from Intense. I'll be renting the puller form ZZP. My last question is, with a 3.5 pulley, do I get a new belt, or larger tentioner? Thanks.............