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The JE Ultra Series 8‑cylinder forged piston kit for GM Gen III/IV LS with a 4.000 in bore and 3.622 in stroke is specified for boosted or high-output LS builds. JE's Aligned Grain Flow forging increases tensile strength for severe cylinder pressures. Thermal barrier crown and skirt coatings lower temperatures and reduce friction; lateral gas ports maintain compression ring seal under boost, and optimized pin oiling plus Trend wrist pins enhance durability. Made in the USA.
JE Pistons Ultra Series GM Gen III/IV LS 4in Bore/3.622in Stroke Set of 8 Pistons
