413 compression question

Greg55_99 said
Pistons are stock 1965 vintage cast flatops. Can't tell you how far down they are. Deck is stock. Heads are stock 70 440. Head gasket is steel.

A "wag" would be helpful as I put this motor together (poorly) in 1979.

Greg

I'd guess anywhere from 9:1 to 10:1, 413 Max wedges were higher compression, somewhere around 11:1 if I remember right. I'm sure someone much more knowledgeable than I will chime in.