JE Pistons Ultra Series GM Gen III/IV LS 4.065in Bore/3.622in Stroke Set of 8 Pistons

JE Pistons is well-known for making strong internal engine components, and their Ultra Series pistons are a prime example of that. If you're building a GM Gen III or IV LS engine that's going to see serious boost or nitrous, these pistons are designed to handle the extreme cylinder pressures that come with those kinds of power adder builds. They're made from 2618 aluminum, which is a solid choice for high-performance applications, and they're manufactured 100% in the USA.

What sets these Ultra Series pistons apart are the custom-level features you get right out of the box. JE's proprietary Aligned Grain Flow forging technology is exclusive to this line and maximizes tensile strength, giving you a well-built piston that can withstand the intense stresses of a high-horsepower engine. You'll also find a thermal barrier crown coating that reflects heat back into the combustion chamber, helping to keep piston crown temperatures down and improving exhaust scavenging. For reduced friction and wear on the skirts and cylinder walls, there's a skirt coating, which also helps quiet down the engine, especially during cold starts. Plus, lateral gas ports are included to help maintain a strong ring seal even at high RPMs and under heavy boost.

This set includes eight pistons, each with a 4.065-inch bore and designed for a 3.622-inch stroke. They also come with high-strength, thick-wall wrist pins from Trend Performance, which are built for the demands of power-adder engines. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're aiming for a high-horsepower LS build, these JE Ultra Series pistons are a solid option to consider for the heart of your engine.