Piston - AutoTec - Twisted Wedge - Forged - Flat Top - 4.030 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 3.80 cc - Small Block Ford - Set of 8 Brand-RACE TEC PISTONS MPN 1000369 . **NOTE: 3.400 Stroke 5.400 Rod Length 1.100 CH AutoTec Series Truck Freight NO