[Jay S]

The 417NP cast pistons are modeled from the 73 and later pistons. The 72 455’s that I have seen did not have the bevel on the top. I just worked on a original 72 a few days ago. The 417NP pistons have a fairly low compression height (1.481”) , and the piston top is likely .020”-.030” below the deck. That range is depending on if your engine has ever been decked, but it likely falls somewhere in that range unless it was zero decked.

From what I recall the total cc’s is suppose to be between 10 and 11 cc’s on those pistons. The compression will be about 9:1, maybe upper 8s.