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The JE Ultra Series forged piston set for GM Gen III/IV LS engines features a 4.005 in bore and 3.622 in stroke in an eight-cylinder kit optimized for high-power applications. Ultra Series uses JE's Aligned Grain Flow forging for enhanced strength and includes thermal barrier crown and skirt coatings, lateral gas ports, optimized pin oiling and Trend Performance wrist pins to manage heat, friction and ring sealing under boost. Made in the USA.
JE Pistons Ultra Series GM Gen III/IV LS 4.005in Bore/3.622in Stroke Set of 8 Pistons
