Piston - Hypereutectic - 4.030 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Small Block Chevy - Set of 8 Brand- SEALED POWER MPN H815DCP30 . **NOTE: Spec Piston for Canada GM 604 Crate Engine Truck Freight- NO State Restrictions Canada Restrictions- NO