JE Pistons Ring Sets 1.2 / 1.2 / 2.5 Subaru EJ257 Block w/EJ20 HeadBrand JE Pistons Part Number JG4904 3937 Category Engine Components Piston Rings Condition Brand New Original Manufacturer Packaging JE Piston Rings are designed to maximize horsepower through precision sealing of combustion pressure. They are offered in a huge selection of sizes, various materials, and in multiple thicknesses to suit a wide variety of engines. JE Pistons also offers an array of custom piston ring services including back cutting, dyke