Piston - AutoTec - Forged - Dished - 4.030 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 12.30 cc - Coated Skirt - Small Block Chevy - Set of 8 Vendor- RACE TEC PISTONS MPN 1000129 State Restrictions Canada Restrictions - NO Notes: 3.480 Stroke 5.700 Rod length 1.550 CH AutoTec Series