Manley STD Stroke 99.55mm +.05mm Bore 8.5:1 Dish Piston and Ring Set Subaru WRX STI EJ257 2004-2021

Part #: 612001C - 4. Manley's forged and dished pistons for the EJ205 are crafted from high - strength 2618 material. They're lightweight but built to last a long time. Every set comes with round wire locks, tool steel wrist pins, and piston rings at no extra cost. A special multi - step top ring groove machining process ensures the best control of the groove's size, shape, flatness, and finish. Precise pinhole machining gives an exact compression distance and accurate lock ring groove spacing, size, and concentricity. Available in standard size and a wide range of oversize/overbore options for high - performance engine builds.

To use these Manley pistons and ring sets, first make sure your engine is properly prepared for installation. Check the engine block and other components for any signs of damage or wear. When installing, follow the standard procedures for piston and ring installation, making sure the parts fit snugly and are properly aligned. For maintenance, regularly check the pistons and rings for any signs of wear or damage. After long - term use, it's a good idea to replace the piston rings to keep the engine running smoothly. Also, keep the engine clean and use high - quality lubricants. Avoid over - revving the engine as it can put unnecessary stress on the pistons. If you notice any unusual noises or performance issues, have the engine checked by a professional as soon as possible.