JE Pistons Ultra Series GM Gen III/IV LS 4.075in Bore/3.622in Stroke Set of 8 Pistons

If you're building a serious performance GM Gen III or Gen IV LS engine, especially one that's going to see boost or nitrous, these JE Pistons Ultra Series pistons are a solid choice. They're designed from the ground up to handle the extreme cylinder pressures that come with power adder applications. JE Pistons uses their proprietary Aligned Grain Flow forging technology, which really maximizes the tensile strength of the aluminum, making these pistons incredibly strong for high-performance engine builds.

What sets these apart are the custom-level features you get right out of the box. You'll find a thermal barrier crown coating that helps reflect heat back into the combustion chamber, keeping the piston crown cooler and improving how the exhaust gases get scavenged. They also come with a skirt coating that cuts down on friction and wear between the piston and cylinder wall, which also helps quiet things down, especially when the engine is cold. Plus, they've got lateral gas ports to help maintain a strong ring seal even at high RPMs and under heavy boost. These pistons are made 100% in the USA, and they include high-strength wrist pins from Trend Performance, built for the demands of serious engine work.

This set is for an 8-cylinder engine with a 4.075-inch bore and a 3.622-inch stroke. Keep in mind these are not CARB approved and cannot be shipped to California. They are designed for high-horsepower racing engines, so they're a great option when you need pistons that can take a beating and keep performing.