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The JE Ultra Series 8‑cylinder forged piston kit for GM Gen III/IV LS with a 4.070 in bore and 4.00 in stroke is built for power-adder applications. JE's Aligned Grain Flow forging increases tensile strength, while thermal barrier crown coating and skirt coating cut crown temperatures and friction. Lateral gas ports maintain ring seal under boost, and optimized pin oiling plus thick-wall wrist pins support reliability. Made in the USA.
JE Pistons Ultra Series GM Gen III/IV LS 4.07in Bore/4in Stroke Set of 8 Pistons
