JE Pistons Ultra Series GM Gen III/IV LS 4in Bore/3.622in Stroke Set of 8 Pistons

If you're building a high-horsepower GM Gen III or IV LS engine, especially one that's going to see boost or nitrous, these Ultra Series forged pistons from JE Pistons are a solid choice. They're designed from the ground up to handle the extreme cylinder pressures that come with serious power adders. JE Pistons has packed these with features you'd typically only find on custom-made pistons, all made right here in the USA.

What sets these apart is JE's proprietary Aligned Grain Flow forging technology. This process maximizes the piston's tensile strength, making it incredibly tough and able to withstand the immense forces inside a high-performance engine. 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 even improve how efficiently exhaust gases are scavenged. For added durability and reduced friction, the piston skirts are coated, which also helps quiet things down, especially during a cold start. Plus, they've got lateral gas ports to help maintain a strong seal on the top compression ring, even when you're running high boost or high RPMs.

This set includes premium, thick-wall wrist pins from Trend Performance, known for their strength in demanding applications. The pistons are also designed with optimized pin oiling to ensure everything stays well-lubricated, reducing heat and wear. These are flat-top pistons with a 4.000-inch bore and a 3.622-inch stroke, featuring a -6.00 cc dish. Keep in mind these are not CARB approved and cannot be shipped to California. If you're aiming for serious power, these pistons are built to get you there.