Platinum = long life (not high performance)
Copper core = high performance
The copper core NGK plugs have excellent quality. I don't know what part number plug for stock heads. I run Autolite copper core plugs. They have very good quality and they are inexpensive. I change plugs so often (several times per racing season) that I can't justify spending more than $1.18/plug.
Autolite part number 25 will work well with stock heads and no power adder. If you're supercharged or spraying nitrous oxide, step down a heat range or two (24's or 23's).
__________________
Craig
Supercharged 93 GT
"I drive way too fast to worry about cholesterol!"
Then I went to the doctor.... whoa 312! Hello Lipitor
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