Piston - AutoTec - Forged - Dome - 4.310 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Plus 27.50 cc - Big Block Chevy - Set of 8 Vendor- RACE TEC PISTONS MPN 1000289 State Restrictions Canada Restrictions - NO Notes: 4.000 Stroke 6.135 Rod Length 1.645 CH AutoTec Series