Don't know what would happen at 8 to 1 but I'm right at 8.5 to 8.6 to 1 with my sig 6bbl car and have about 155-160 lbs cranking cylinder pressure. Been together long enough I can't remember how far down the piston was but, it was a ways. W/a hughes 1523 cam & headers (through full exhaust) my 4100# car runs 13.1-13.2 @ 107 at 2,000 elevation. I did clean up the bowls/ports a little. Pretty much a slug but still fun to drive & idles smooth @ 800 rpm. Oh, all on 87 octane, too!


Oops, no sig picture. Forgot I was on the kids computer, too early here! This car