21521-RS-8 Diamond Pistons LS2K 429 LS3 15° Forged Flat Top 4.070 Bore

Diamond Pistons are some of the best aftermarket pistons on the market. Trust your new engine with a set of Diamond Pistons
Diamond LS2K 15 degree forged flat top pistons are rated to support 2000 horsepower. Diamond LS2K Pistons feature 3D milling on the piston crowns for ready to install finish. Piston feature inboard forging design with fully machined under crown for maximum strength. Valve pockets are designed to work with most all LS 15 degree cylinder heads. Side gas ports are added for better ring seal along with Moly skirt coating for friction loss and skirt wear protection. Top ring is down .280 on (1.115cd) and .250 on (1.053cd) pistons. Premium steel 1.5mm top ring, 1.5mm napier second, with standard tension 3.0mm ring package included. Premium H-13 .225 wall wrist pins included and chamfered for round wire locks included. Valve pocket depth .200 Intake, and .145 on the Exhaust. Compression ratios are figured using .053 head gasket. Diamond LS2K Pistons are 2618 material and are designed for HP-NOS-Boost applications, Rated for 2000 HP

Compression Ratio:

64cc 12.0:1

69cc 11.3:1

72cc 11.0:1