Piston - AutoTec - Forged - Dome - 4.500 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Plus 12.60 cc - Big Block Chevy - Set of 8 Vendor- RACE TEC PISTONS MPN 1000311 State Restrictions Canada Restrictions - NO Notes: 4.250 Stroke 6.385 Rod Length 1.270 CH AutoTec Series