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Hi boys!......just wondering what heat range I sould go with for plugs. The cars an '89 5.0L, 306, stock heads, E303 cam, upper lower cobra intake, 70mm TB, Vortech A-trim supercharger (10psi) I'm gonna run Motorcraft plugs, but i was wondering how many heat ranges I should go colder?

Chris
 

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I ran stock plugs for years, and tuned around them. I just switched to one heat range colder than stock, but it seems like the idle hangs up a bit longer than it did with stock plugs. Kind of annoying.

I tried colder plugs a few years back and ended up going back to stock for exactly the same reason. I think I'll stick with one heat range colder than stock this time.
 
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