This item is for eight (8) Standard size pistons and a matching moly piston ring set compatible with 2007 -2011 GM 6.2L V-8 truck engines VIN Codes 2, 8, or F. Vin refers to the 8th character in the vehicles ID in lower driver side dash. Flat top piston with 2-valve reliefs and floating pins. These pistons are manufactured to meet or exceed O.E.M. specifications. compatible with Kit 2007-11 GM Chevy 6.2L LC9 LH6 LMG LY5 These pistons are for : Floating rods Flat top coated skirts 2 valve relief. Comp. Dist. 1.339" Pin Dia. .943" Replaces OE 19178597