JE Pistons Ultra Series GM Gen III/IV LS 4.13in Bore/3.622in Stroke Set of 8 Pistons

When you're building a serious GM Gen III/IV LS engine, especially one that's going to see boost or nitrous, you need pistons that can handle the pressure. This set of eight Ultra Series forged pistons from JE Pistons is designed for just that. You get the pistons themselves, which are forged using JE's proprietary Aligned Grain Flow technology for maximum strength, along with high-strength wrist pins from Trend Performance, and all the coatings and features you'd expect at this level.

These aren't just basic pistons. The Ultra Series features a thermal barrier crown coating that helps reflect heat back into the combustion chamber, which can improve scavenging and keep crown temperatures down. The skirts are coated to reduce friction and noise, especially noticeable during cold starts. Plus, they have lateral gas ports to help maintain a solid seal on the top compression ring, even when you're pushing high RPMs and significant boost. Every feature is optimized for high-horsepower racing engines, and they're all made 100% in the USA.

This set is designed for a 4.130-inch bore with a 3.622-inch stroke, and includes everything you need to outfit an 8-cylinder engine. Keep in mind these are not CARB approved and cannot be shipped to California. For builds demanding the utmost in piston strength and advanced features, this set is a solid choice.