seems 440 builders are getting expensive around here, grab them if the price is right. My notes from the old Silv-o-lite catalog show the 72 and up 8:1 pistons have a compression height of 1.912" The 66-71, 9:1 pistons have a compression height of 1.970" The 66-71 HP, CH = 1.990"? (this still seems fairly low compression?) The TRW six-pack piston, CH = 2.061"
