JE Pistons Ultra Series GM Gen V LT4 4.075in Bore/4in Stroke Set of 8 Pistons

If you're building a high-horsepower GM Gen V LT4 engine, especially one that will see boost or nitrous, JE Pistons' Ultra Series forged pistons are a solid choice. These aren't your average off-the-shelf pistons; they're packed with features typically found only in custom setups, all designed to handle the intense cylinder pressures that come with serious power adders. They're made to fit a 4.075-inch bore with a 4-inch stroke, and you get a full set of eight.

What sets these apart is JE's proprietary Aligned Grain Flow forging technology. This process maximizes the piston's tensile strength, giving it the backbone needed to endure extreme conditions. 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 exhaust gases are scavenged. For reduced friction and wear on the skirts and cylinder walls, there's a skirt coating, which also helps quiet things down, especially during a cold start. Plus, they've got lateral gas ports to help maintain a strong ring seal, even at high RPMs and under heavy boost. These pistons also feature optimized pin oiling for better lubrication of the wrist pin and bore, reducing heat and wear.

Every part of the Ultra Series piston is geared towards high-horsepower racing engines, and they're all made 100% in the USA. This set includes high-strength wrist pins manufactured by Trend Performance, designed to handle the demands of power-adder builds. Keep in mind these pistons are not CARB approved and cannot be shipped to California. For a robust engine build that can handle serious power, these pistons are a well-built option.