willwren,

Platinum is a problem eh? I ran 2 sets of them to 240K in my '92 SSE. Are they not compatible with the Gen II? What is wrong with them?

They run to hot. The platinums are made for durability not performance and bosch platinums seem to have issues with out motors.

What plugs are recommended for longevity and performance in a stock to mildly modded 2k+ L67? I have read numerous posts on the subject, but never really found a definitive answer. Opinions are very welcome here. I would like to drop 1 heat range in expectance of a FWI, 180* stat, and 3.4" pulley (all of the above by next summer) and would like to replace the plugs (which are double plats) sometime while I still have time and nice weather to do it. How do the iridiums rate with other regular copper plugs? Do they (iridiums) last longer than the coppers? How do NGK & Autolite compare as far as quality?

I hate to hijack this thread, but I think this could be a question that would benefit us all. I'm sure that once I get the hang of it, changing the plugs out every 10-15k wouldn't be too much of a problem (which I assume would be the recommended change rate for coppers). One thing that I do miss about my old 3.5L Intrepid was how easy it was to change the spark plugs. It was a quick 4 minute job!

For supercharged cars, stay away from Platinum. Non-modded NA'* can run them fine, but Bosch isn't too happy even then.

Read the "Tech Talk with NGK" sticky in Performance for plug reccommendations. Basically any NGK or AC Delco. Copper or Irridium. Mods dictate heat range.

Can't forget Autolites Bill.

Agreed

No disrespect intended, just reverse the numbering sequence for Autolite heat ranges. No intention to limit the options, just stuck with NGK for comparitive purposes, since they also make the AC Delco plugs.

What about the Denso Iridium plugs? They say the give you more power.Are the MSD coils worth the price for a 2k SSEi and do you have the MSD part numbers for them.

My opinion on plugs is that it takes a MAJOR breakthrough to produce 'more power'. Almost certainly, you won't feel the difference in the Denso'*, and I don't think they're worth the price.

MSD coils will have no performance advantage over 97+ OEM coils. If you want to anyway, the part number is 8224, and you won't need adapter modules unless you're going to replace the ICM with the DIS system.

Thanks for the fast response. So what plugs would you recommend I plan on going with a 3,4 pulley and I have the MSD wires.Do you think I need a trans cooler with the pulley upgrade?