318 pistons

I wouldn't use them you could get the same with a .050 head cut and a thin head gasket . plus no valve reliefs.I used a set of badger piston that were flat top ,no valve reliefs for a 360 build that were advertised to raise compression but were lower compression then the dish stock ones ,also had to cut off .100 of deck to get them.015 below deck ,then with a 454 lift cam had to have pistons flycut .125 for valve clearance.sometimes everything just snow balls.