JE Pistons Ultra Series GM Gen III/IV LS 4.075in Bore 1.304 CD (Right Side) - Single Piston

JE Pistons is known for making strong, well-built internal engine components, and their Ultra Series pistons are a prime example of that. If you're building a high-horsepower GM LS Gen III or IV engine, especially one that will see boost or nitrous, these pistons are designed to handle the extreme cylinder pressures you'll be throwing at them. They feature JE's proprietary Aligned Grain Flow forging technology, which maximizes tensile strength to stand up to the toughest demands.

These aren't just basic pistons; they come with custom-level features right out of the box. The thermal barrier crown coating helps reflect heat back into the combustion chamber, keeping the piston crown cooler and improving exhaust gas scavenging. On the sides, a skirt coating reduces friction and wear on the cylinder walls, which also helps quiet things down, particularly during a cold start. For added reliability under high RPM and boost, lateral gas ports help maintain a solid seal on the top compression ring, and they include high-strength, thick-wall wrist pins from Trend Performance, plus optimized pin oiling to keep everything well-lubricated.

Everything about these pistons is geared towards performance in demanding engine builds. They are made 100% in the USA, ensuring you're getting a well-made part for your project.