Quote:
Originally Posted by Schurkey
First Guess: The deposits you saw were from the gasoline used, not from "overheating".
Second Guess: A straight interchange from AC to NGK won't hurt a thing. Going colder may--or may not--promote fouling.
Third Guess: .060 gap is just fine, but I'd consider smaller. Excess gap promotes misfire if the insulation on the secondary circuit has flaws. I'm pretty sure my 3.4L DOHC uses a .045 or .040 gap.
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That's what I thought as well because I have used injector cleaner and such but when researching online I found many instances where over heated plugs looked just like the ones I took out of my car.
I really don't understand why the manufacturer puts the recomended gap size so far apart on my car but I know that supercharged medals of my car and yes I have seen some crazy people supercharg the gm 3100 Gen 2 and they all said they use .045 gap.