Considering we've got to have flat-top pistons, PV becomes the issue. I'll tell you that right around 12:1 is a pretty good figure. Its not outlandish compression like you see with the hot-street/bandit motors, but its definitely better than stock :^o I've run mine on pump 94 around town without any problem, but most of the time I've got some race fuel in it adding some octane. I know a guy who runs his 12.7:1 347 motor as a driver, changes to slicks at the track, puts 300HP squirts to it and runs low nines. Then puts the street tires back on it and drives it home! My whole point was that with the kind of mods you guys are talking about you shouldn't have one bit of trouble getting well past 450HP.
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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team