Manley 99.5mm STD Bore Pistons Subaru WRX 2002-2014 / STI 2004-2021 | 612000C-4

Part #: 612000C - 4. These Manley pistons for the EJ257 are forged and dished, made from high - strength 2618 material. They're lightweight but tough, offering a long service life. Every set comes with round wire locks, tool steel wrist pins, and piston rings at no extra cost. A special multi - step machining process for the top ring groove ensures perfect control of its 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. All Manley pistons include a full set of four pistons, piston rings, and hardware. (99.5mm STD Bore, 8.5 Comp. Ratio)

Using these Manley pistons is straightforward. When installing, make sure to handle them gently as they're high - quality parts. First, check all the included components like the piston rings, wrist pins, and round wire locks. Ensure that they are in good condition. Before fitting the pistons into the engine, clean the engine block thoroughly to prevent any debris from getting inside. The pistons are designed to work well in high - performance engines, but avoid over - revving the engine right after installation. For maintenance, regularly check the piston rings for wear. If you notice any signs of excessive wear or damage, replace the parts as soon as possible. Also, keep the engine well - lubricated to extend the life of the pistons. Remember, these pistons come in a set of four, so always use them as a complete set for optimal performance.