[JRyan]

Lou,

Yes there are specs for all that. NHRA tech has them and uses them to certify pistons for the accepted list. Although they don't give cc volumes for all flat-top pistons with notches, they do for all the flat-top Clevelands. The Chevy pistons are hit and miss, but if you want to look at the blueprint specs for the 1970 Chevy engines, you'll see lots of volumes for flat-tops. Bill's engine has domes so no valve relief spec would be given, but they have it at NHRA. Whether they'd want to enforce it as a minimum spec for compression or a maximum spec for cam fitment would be up to them. Maybe I should ask NHRA as we run an original Boss 351 Mustang (so you're wrong again Bill as I mentioned our car on one of your first threads). We don't race it MUCH or HARD, because it has the original #'s matching block in it but yeah, you would be hurting our combo.

Jon,

Yep, that's the car. I helped work on it a couple of times when it was up in this area. As far as I know, the replacement version was sold to someone on the East Coast but hasn't been raced since sold.

Jerry

Jerry