273 Piston Question

Hyper_pak said
Do you know what it would be with a 302 head? CR? The 318 magnum head? I hear 59 I hear 63. I know the only way is to CC them to be sure.

Spot on. You need to cc them. the 273 heads are what, 57 cc according to the book? I shaved .030 off mine to get there. the 302's and the magnums are closed chamber but larger than the closed chamber 273/318 heads