I thought heavy rod motors (70-72HP motors) had a tall compression height piston, IE, FM-2355 "sixpack" piston? As the "stock replacement" FM- 2266 piston is below deck quite a bit.
Reason I'm asking, friend is rebuilding his original motor in his super bird and though it had been rebuilt, it had cast pistons without valve reliefs and pentastars on the inside of the pistons.
Getting ready for assembly, he's got the 6-pack, 2355 pintons ready to be installed.
If it's not a 6pk motor it didn't have valve reliefs and was lower in the bore than the 6pk motors.
