Set of 8 hypereutectic Standard 3.897 bore diameter flat top, coated skirt pistons and a matching moly piston ring set compatible with 1997-2004 GM 5.7L LS1 V-8 engines with press-fit pins. VIN codes "G" & "S". VIN refers to the 8th character in the vehicles ID in lower driver side dash. Pistons feature: Head Type: Flat top with no valve reliefs. Piston Material: Hyper eutectic aluminum. Compression Height: 1.330 in. Replaces OEM 88984245 Wrist Pin Style: Press-fit. Wrist Pin Diameter: .945 in.; Pins included. NOTE: Please confirm Pin .945" diameter. Some later models have pin diameter of .943" and Floating Pins. For Standard 3.898" inch bore diameter Blocks!