JE Pistons Ultra Series GM Gen V LT1 4.065in Bore/4in Stroke Set of 8 Pistons

JE Pistons' Ultra Series pistons start with a unique Aligned Grain Flow forging process, an in-house technique that maximizes tensile strength. This is crucial for handling the extreme cylinder pressures you'll encounter in high-horsepower, power-adder engine builds, especially those running boost or nitrous. These aren't just basic pistons; they come equipped with features you'd typically only find on custom-ordered sets.

You'll find a thermal barrier crown coating, which is a ceramic-based material that reflects heat back into the combustion chamber. This helps lower piston crown temperatures and can improve how efficiently exhaust gases are scavenged. The pistons also feature a skirt coating designed to reduce friction and wear against the cylinder walls, which also helps quiet down engine noise, particularly when the engine is cold. To keep things well-lubricated under high stress, they include optimized pin oiling features and high-strength wrist pins from Trend Performance, built for demanding applications. Lateral gas ports are included to help maintain a solid ring seal on the top compression ring, even at high RPMs and under significant boost.

Every aspect of these Ultra Series pistons is optimized for high-horsepower racing engines. They are made from 2618 aluminum and feature an inverted dome/dish design. This set is specifically for GM Gen V LT1 engines with a 4.065-inch bore and a 4-inch stroke, including a 0.927-inch pin diameter. All JE Pistons products, including this set, are manufactured 100% in the USA.