Re: Spark Plug Heat Range
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Originally Posted by XfireZ51
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.
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Sorry the 41602s are in my Z
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1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Shelby Series 1 - Wilwood Brakes
Custom Interior
NCM Lifetime Member #978
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