JE Pistons Ultra Series GM Gen III/IV LS 4.135in Bore/3.622in Stroke Set of 8 Pistons

When you're building a serious GM Gen III or 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 pistons from JE Pistons is designed for exactly that. You get the pistons themselves, which are forged from 2618 aluminum for strength, along with high-strength wrist pins from Trend Performance, all made right here in the USA.

What sets these Ultra Series pistons apart is the attention to detail for extreme performance. They feature JE's proprietary Aligned Grain Flow forging, which makes them incredibly strong to resist the high cylinder pressures you'll encounter. The thermal barrier crown coating helps reflect heat, keeping temperatures down and improving how efficiently the engine breathes. Plus, there's a skirt coating to reduce friction and noise, and lateral gas ports to ensure the top ring maintains a solid seal even under heavy boost and at high RPM. These are custom-level features you're getting right out of the box, designed to keep your engine running strong when you push it hard.

This kit is configured for a 4.135-inch bore and includes pistons with a -11.10cc dish, suitable for a 3.622-inch stroke. Keep in mind these pistons are not CARB approved and cannot be shipped to California. If you're aiming for big horsepower and need a reliable foundation, this set is a solid choice.