Piston - AutoTec - Forged - Dished - 4.030 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 20.00 cc - Small Block Ford - Set of 8 Vendor- RACE TEC PISTONS MPN 1000390 State Restrictions Canada Restrictions - NO Notes: 3.400 Stroke 5.400 Rod Length 1.100 CH AutoTec Series