JE Pistons Ultra Series GM Gen V LT4 4.065in Bore/3.622in Stroke Set of 8 Pistons

JE Pistons is known for making some of the strongest pistons you can get off the shelf, and their Ultra Series is a prime example. If you're building a GM Gen V LT4 engine, especially one that's going to see boost or nitrous, these pistons are built to handle the extreme cylinder pressures that come with that kind of power. They're designed for a 4.065-inch bore and a 3.622-inch stroke, fitting right into your LT4 build.

What sets these apart is JE's proprietary Aligned Grain Flow forging technology. This process maximizes the tensile strength of the aluminum, making them incredibly tough for high-performance engine environments. You also get 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. The pistons also come with a skirt coating to reduce friction and wear on the cylinder walls, which also helps quiet things down, especially during a cold start. Plus, they've got lateral gas ports to help maintain a solid ring seal even when you're running high RPMs and serious boost.

These Ultra Series pistons are made 100% in the USA and include high-strength wrist pins from Trend Performance, designed specifically for the demands of power-adder builds. They also feature optimized pin oiling to ensure everything stays well-lubricated. Keep in mind these are not CARB approved and cannot be shipped to California.