I've been told that the blown alcohol Hemi motors need around 11.5 to 1 or higher mechanical compression to make good power with 30+ Lbs. of boost I'm thinking of finding out on a wedge all aluminum street motor with a Pro Charger with EFI
Wedge, or hemi blown alky works with 11 to 12:1 static. they'll work with lower static, but most are around 11 or higher. My roots blown hemi is 12:1 static. Piston is .045 down, with a .052 gasket. I run my nitrous motors the same in place of softening the chamber, .09 to .120 away from the head with nothing sharp in the chamber, or on the piston. Once you soften the chamber it's a long road back to a good NA head so a big space between the head and the piston has about the same result.
