This listing is for set (8) Hypereutectic Flat Top coated Pistons with Floating pins, clips and matching rings compatible with 1999-2009 GM Chevrolet LS 4.8L & 5.3L Engines GEN III & IV in your choice of sizes. These pistons are replacements for these applications: 1999-06 4.8L VIN Code V and 2005-2009 4.8L VIN Code C or K. Also fits, 2005-09 5.3L VIN Codes B, M, J, 0, 3 & C engine LM4, LS4, L33, LH8, LH6, LMG, LY5, LY2, L20. All with Floating Pins. Pistons are Hypereutectic Coated Skirts includes Pins. Compression Height: 1.323, NOTE: Pin Diameter: .943"; pins included (Please measure for accuracy). Some early models had .945" Pin. Ring Grooves are: [email protected] and 1 @ 3.0MM thickness. Select size needed from drop down box before adding to cart!