JE Pistons COSWORTH N5B 8:1 KIT Set of 4 Pistons

If you're building a high-performance 4-cylinder engine, especially one based on the Cosworth N5B platform, this set of four forged pistons from JE Pistons is a solid choice. JE Pistons has been making performance pistons for over 75 years, and they engineer and forge these right here in the USA using 2618 aluminum. This material offers the high tensile strength needed to handle the demands of performance applications, whether you're on the track or just pushing your engine hard.

What sets these pistons apart is their specific design for the N5B engine. They feature JE's proprietary Forged Side Relief (FSR) forging design, which helps reduce friction and power loss by using a narrower skirt. This design also saves weight. Depending on the specific application, you might also find an accumulator groove, which helps manage combustion gas pressure to improve ring seal and keep power consistent. Some applications also include a skirt coating to further reduce friction and wear, which can also quiet down the engine operation.

This kit comes complete with everything you need to get these pistons installed: high-quality wrist pins, locks, and JE's Pro Seal premium piston rings. They are designed with an 8.00:1 compression ratio and a 3.622-inch bore, featuring an inverted dome/dish design. Remember, these pistons are not CARB approved and cannot be shipped to California.