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Originally Posted by BILTIT
I ran them on my old 400 at about 10.4:1 and 91-93 octane. Had lots of overlap in cam, only thing that saved me i think, and i ran fairly rich.
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That's what I've found to be true as well. I'm running some 670's on my 455. Last cam it pinged like the dickens, a street/strip hyd. This cam, a solid drag race comp cam with lots of overlap, I'm finding that I can use 93 when needed to get home from a far away show, for example. I don't do it regularly but can get away with it when needed. It has 12.1 compression too! I really need to fatten up my carb again, now that it's driven more on the street these days.
Phil
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