how much compression for pump gas

Yep to throw in what Moper said, if you enough cam IE overlap then your low rpm compression is reduced. So then you can get away with a higher static number. I guess the real awnser is what is the compression on a gauge while cranking?

Maybe we can start a list of cams, heads, pistons etc to build a real list? I kind of think that anything above 180 psi at cranking speed is about the limit on iron heads with 92 oct at sea level on a warm day? I know hemis, alum. heads, and a few others are more fogiving. But in the old days a semi stock cam in a 383 yeilded 240 with 10.5s. Man it was tuff even on 95 oct. for me as I recall :scratch:

Sometimes you gotta find a balance betweenhow much squize and how much you have to back off on the advance.

Thats why today we have cpu's in cars to tweak it as best possible. :headbang: