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Diamond Racing Pistons LS2K 15* 4.125" Stroke Dish PistonsVarious Bore Sizes-20cc to -24cc Volume (Varies By Bore Size)1.053" Comp. Height3D milling on piston crowns for ready to install finishInboard forging design with fully machined under crown for maximum strengthValve pockets designed to work with most aftermarket 12° cylinder headsSide gas ports for better ring sealMoly skirt coating for friction loss and skirt wear protectionTop ring down dimension: .250"Premium 1.5mm x 1.5mm x 3.0mm ring package includedPremium H-13 .225W wrist pins included chamfered for round wire locksValve pocket depth: 0.220" intake and .162" exhaust2618 material for High HP-NOS-Boost applications - rated for 2000HP*Must use 6.125" Rods*