Piston Set of 6Fits Gm Chevy 3.1L 189 Aluminum Cylinder Head Coated Skirt Dish TopSize = .50mm OversizedBore Diameter (STD)AlloyTop Ring2nd RingOil RingPin DiameterCompression Height89.00mm (3.504in)Hypereutectic1.50mm1.50mm4.00mm0.90591.443Need Rings? To check our inventory, please Click Here for Cast or Click Here for Moly