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The JE Ultra Series forged piston set for GM Gen III/IV LS engines features a 4.135 in bore and 4.000 in stroke in an eight-cylinder kit built for high-pressure, power-adder environments. Ultra Series pairs JE's Aligned Grain Flow forging with thermal barrier crown and skirt coatings, lateral gas ports, optimized pin oiling and Trend Performance wrist pins to improve durability, reduce friction and protect ring seal. Made in the USA.
JE Pistons Ultra Series GM Gen III/IV LS 4.135in Bore/4in Stroke Set of 8 Pistons
