JE Pistons SUB EJ257 83mm STR 99.75mm Bore CR 8.5 KIT Set of 4 Pistons

When you're rebuilding the engine for your Subaru Impreza, Forester, or Legacy, especially for performance applications, a solid set of pistons is crucial. This kit from JE Pistons includes four forged pistons, specifically designed for the EJ257 engine. They feature an 83mm bore and a compression ratio of 8.5:1, making them a strong choice for builds aiming for increased power and durability.

JE Pistons has been making high-performance pistons for over 75 years, and these are forged in the USA from 2618 aluminum, which offers the high tensile strength needed for demanding engine work. They incorporate JE's proprietary Forged Side Relief (FSR) design, which helps reduce friction and save weight by using a shorter wrist pin and reduced skirt width. Depending on the specific application, you might also find an accumulator groove to help manage combustion gas pressure, improving ring seal and reducing flutter. A skirt coating, if included for your application, further reduces friction and wear on the cylinder walls, leading to quieter operation and longer life.

This kit comes complete with high-quality wrist pins, locks, and JE's Pro Seal premium piston rings, so you have the essential components to get your engine back together. These pistons are made 100% in the USA and are engineered specifically for the EJ257 engine to optimize performance and durability. Please note that these are not CARB approved and cannot be shipped to California.