Piston - AutoTec - Forged - Dished - 4.155 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 25.50 cc - Small Block Chevy - Set of 8 Vendor- RACE TEC PISTONS MPN 1000216 State Restrictions Canada Restrictions - NO Notes: 4.000 Stroke 6.000 Rod length 1.000 CH AutoTec Series