JE Pistons Ultra Series GM Gen III/IV LS 4.07in Bore/3.622in Stroke Set of 8 Pistons

JE Pistons is well-known for making strong, reliable internal engine components. For your GM Gen III/IV LS engine build, their Ultra Series forged pistons are designed to handle the extreme demands of high-horsepower applications. These aren't your average pistons; they're packed with features typically found only in custom setups, making them a solid choice when you're pushing the limits with boost or nitrous.

What sets these Ultra Series pistons apart is JE's proprietary Aligned Grain Flow forging technology. This process aligns the grain structure of the aluminum to maximize tensile strength, giving them the toughness needed to withstand the intense cylinder pressures common in power-adder engine builds. You'll also find a thermal barrier crown coating, which is a ceramic-based material that reflects heat back into the combustion chamber. This helps keep piston crown temperatures down and can improve how efficiently exhaust gases are scavenged. For reduced friction and wear on the skirts and cylinder walls, a skirt coating is applied, which also helps quiet down the engine, especially during cold starts. To ensure proper lubrication in the critical pin, pin bore, and small-end areas, these pistons feature optimized pin oiling. Plus, lateral gas ports are included to help maintain a strong ring seal even at high RPMs and under significant boost.

This set includes eight pistons, each with a 4.070-inch bore and a -8.70cc dish volume, designed for a 3.622-inch stroke. They come with high-strength Trend Performance wrist pins, which are built to handle the stresses of performance engine builds. Every component in this set is made 100% in the USA, reflecting JE Pistons' commitment to quality manufacturing. Keep in mind that these pistons are not CARB approved and cannot be shipped to California.