Piston - AutoTec - Forged - Dished - 4.030 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 18.90 cc - Coated Skirt - Small Block Chevy - Set of 8 Brand-RACE TEC PISTONS MPN 1000145 . **NOTE: 3.750 Stroke 5.700 Rod length 1.425 CH AutoTec Series Truck Freight NO