Piston - AutoTec - Dished - Forged - 4.070 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 22.70 cc - GM LS-Series - Set of 8 Vendor- RACE TEC PISTONS MPN 1001713 State Restrictions Canada Restrictions - NO Notes: 4.000 Stroke 6..125 Rod 1.110 CH W/Combo Pocket AutoTec II