Piston Set of 8Fits GM 7.4L 454 Flat Top Coated HyperSize= STDBore Diameter (STD)AlloyTop Ring2nd RingOil RingPin DiameterCompression Height107.95mm (4.250in)Hypereutectic5/64in5/64in3/16in0.98981.625Need Rings? To check our inventory, please Click Here for Moly or Click Here for Cast