JE Pistons and Rings 99.5 Bore 79mm Stroke 9.5:1 Comp Subaru WRX / STI EJ257 2004-2021

Part #: 310936. JE piston designs are crafted for extreme applications, even professional competition in your Subaru WRX and STI. In high - stress scenarios with high compression ratios, high boost, or heavy nitrous use, the 2618 aluminum alloy with high tensile strength is a must. Fitment includes SUBARU EJ257 TIME ATTACK 'FSR'. Note: Now compatible with either OEM or aftermarket rods! Some blocks may need clearance for stroker applications. Features: No deburring or prep needed for dome/dish; 2618 T6 high - tensile forged aluminum; Dome and dishes have smooth radii for great flame travel; 1.2 x 1.2 x 2.5mm ring widths; Comes with .905 x 2.500 (Round Forging) and .905 x 2.250” (FSR Forging) straight - wall carbon steel wrist pin; Pin fitting and Tru - Arc locks are included; Package has 4 pistons and 4 rings.

Using these JE pistons and rings is straightforward. First, make sure your engine is properly prepped. Check if your block needs clearance for stroker applications as some might. The pistons are made of 2618 T6 high - tensile forged aluminum, which is tough and suitable for high - stress situations. The dome and dish don't need deburring or preparation, so you can install them right away. The package comes with wrist pins, pin fittings, and Tru - Arc locks. When installing, ensure the rings are properly seated with the correct ring widths of 1.2 x 1.2 x 2.5mm. These pistons and rings are compatible with both OEM and aftermarket rods. For maintenance, regularly check the pistons and rings for wear. If you notice any signs of damage or excessive wear, it's time to replace them. Keep your engine well - lubricated to ensure the longevity of these parts.