Piston - AutoTec - Dished - Forged - 4.070 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 13.20 cc - GM LS-Series - Set of 8 Vendor- RACE TEC PISTONS MPN 1001694 State Restrictions Canada Restrictions - NO Notes: 3.622 Stroke 6..125 Rod 1.304 CH W/Combo Pocket AutoTec II