[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.

[6567GTO]

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.

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