JE Pistons BMW S50B30US 12.5KIT Set of 6 Pistons

This kit from JE Pistons gives you a complete set of six forged pistons specifically made for the BMW S50B30US engine. You'll get the pistons themselves, along with high-quality wrist pins, locks, and JE's Pro Seal premium piston rings. These are designed to handle the rigors of performance applications, whether you're building a track car or a serious street machine.

JE Pistons has been in the forged piston game for over 75 years, and they build these right here in the USA using 2618 aluminum. This material offers the strong tensile strength needed for high-demand performance. They've incorporated their proprietary Forged Side Relief (FSR) design, which helps minimize friction and reduce weight by using a narrower skirt and a shorter wrist pin. Depending on the specific application, you might also find an accumulator groove to help control combustion gas pressure, leading to better ring seal and consistent power, and a skirt coating to cut down on friction and noise.

These pistons are built with an inverted dome/dish design and feature a 3.386-inch bore, aiming for a 12.50:1 compression ratio. It's important to note that these pistons are not CARB approved and cannot be shipped to California. If you're rebuilding the top end of your S50B30US and need a robust, USA-made piston set built for performance, this JE Pistons kit is a solid option.