Piston - AutoTec - Forged - Dished - 4.040 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 12.30 cc - Coated Skirt - Small Block Chevy - Set of 8 Brand-RACE TEC PISTONS MPN 1000135 . **NOTE: 3.480 Stroke 6.000 Rod length 1.250 CH AutoTec Series Truck Freight NO