Je Pistons Piston - 18 Degree Small Block Dome - Forged - 4.145 in Bore - 1/16 x 1/16 x 3/16 in Ring Grooves - Plus 3.30 cc - Small Block Chevy - Set of 8-213121--Notes: State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO