Single PistonFits GM & Chevrolet 7.4L 454 Flat Top Hyper Coated SkirtSize = .030 OversizedBore 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 Cast or Click Here for Moly