Icon Pistons Piston - FHR Forged - Forged - 4.040 in Bore - 1.5 mm x 1.5 mm x 3.0 mm Ring Grooves - Minus 10.00 cc - Small Block Chevy - Set of 8-IC10004-.040--Notes: State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO