Piston - AutoTec - Twisted Wedge - 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 Brand-RACE TEC PISTONS MPN 1000410 . **NOTE: 3.400 Stroke 5.400 Rod Length 1.100 CH AutoTec Series Truck Freight NO