JE Pistons 361331 Piston Set 2618 Inv Dome/Dish 3.927 Bore 1.209 CD .905 Pin 4Pc

Piston Set, 2618, Inv Dome/Dish, 3.927 Bore, 1.209 CD, 0.905 Pin, Set of 4. Ultra Series forged pistons from JE are the industry’s strongest, most fully featured pistons available off the shelf. Offered for Subaru STI EJ257 Engines. Ultra Series Pistons feature JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Equipped with the following custom level features JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Designed specifically for Subaru STI EJ257 Engines. To provide optimized performance durability Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings Made 100% in the USA Accumulator Groove: A specialty groove between the top and second ring provides added volume for blow-by gases. This helps reduce pressure between the rings, improving top ring seal and minimizing ring flutter at high cylinder pressures.