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Originally Posted by -=Jeff=-
I used 41602 Ac Delco in my car, why did you go with the 41630?
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Your car meaning the 89 or the ZR? That's what Al suggested and I believe they are the equivalent of the NGKs. There must be some other difference between 630's and 602's. If its heat range only, one of us if WAY off.
FR,
The NGKs I had were the TR5IX Iridiums. As the article said, the more power you're making, the more heat your putting in. Therefore the need for colder plug. I don't think I'm that far off either. But its enough to make a difference and worth investigating.