Piston - AutoTec - Forged - Flat Top - 4.005 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 3.30 cc - GM LS-Series - Set of 8 Vendor- RACE TEC PISTONS MPN 1000603 State Restrictions Canada Restrictions - NO Notes: 15-Degree 4.000 Stroke 6.125 Rod 1.115 CH AutoTec Series