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

The Aligned Grain Flow forging technology used in these JE Pistons Ultra Series pistons is a notable design choice, maximizing tensile strength to handle the intense cylinder pressures found in high-performance engine builds. These pistons are specifically made for GM Gen III and Gen IV LS engines, featuring a 4.070-inch bore and designed to work with a 3.622-inch stroke. They are built to withstand the demands of boosted or nitrous-fed V8 engines, making them a solid option for serious engine work.

Beyond their advanced forging process, these Ultra Series pistons come equipped with features typically found only in custom setups. The thermal barrier crown coating helps reflect heat back into the combustion chamber, which can improve efficiency and reduce crown temperatures. A skirt coating is applied to cut down on friction and wear between the piston and cylinder wall, also contributing to quieter operation, especially when the engine is cold. Lateral gas ports are included to help maintain a strong seal for the top compression ring, even under high RPM and significant boost conditions. The set also includes high-strength wrist pins from Trend Performance and optimized pin oiling features to ensure proper lubrication in the pin bores and small ends, reducing heat and wear.

Every component in this set of eight pistons is manufactured 100% in the USA, ensuring a high standard of production. It's important to note that these pistons are not CARB approved and cannot be shipped to California. If you're building a high-horsepower LS engine that will see significant stress from power adders, these pistons offer a well-built, feature-rich solution.