This listing is for a set of eight (8) STD 4.250" Bore hypereutectic, coated skirt pistons and ring set compatible replacements for 1996-97 VIN "J" and VIN "N" and 1998-2000 VIN "J" Chevrolet and GMC Truck models with the 454ci (7.4L) V-8 engine. VIN refers to the 8th character in the vehicles ID in lower driver side dash. P/N (8) H749CP+41617. Piston specifications are as follows: HEAD TYPE: Flat head w/2-valve reliefs RING LANDS: 5/64"-5/64"-3/16" COMP. DISTANCE: 1.625" PIN DIAMETER: .9893"