Manley 100.0mm Bore Pistons +.50mm Size 8.5:1 Dish Extreme Duty Subaru WRX / STI EJ257

Part #: 632205CE-4. Our new Turbo Tuff lineup for EJ25 engines makes us the top aftermarket Subaru piston company. These pistons, forged with design enhancements from our 'Formula-Won' model, are the ultimate choice. They can handle high boost and stress, yet run quietly and trouble-free for daily use. Made from 2618 alloy, they have an offset wrist pin design, skirt coating, and come with a standard 2.500' x .180' wall premium chrome moly wrist pin (P/N 42346). You can also upgrade to 9310 alloy .210' wall pins. Order the EXTREME DUTY part number for pistons with 9310 pins (P/N 42546). Each set includes premium steel top rings, Napier style second rings, and higher tension oil rings for great oil control, along with round wire locks. Recommended clearance is .003' for mild boost and .0035' for high boost, measured .850' (79/83mm Strokes) and 1.100' (75mm Stroke) from the bottom of the oil ring groove. Our Manley Subaru EJ257 pistons now feature Napier style second rings and higher tension oil rings (by Total Seal) for excellent oil control.

Using these Manley pistons is straightforward. First, make sure to check the recommended clearance based on your boost level. For mildly boosted engines, aim for a .003' clearance, and for highly boosted ones, go for .0035'. When installing, handle the pistons carefully as they are precision - made parts. Always use the provided round wire locks to secure the wrist pins. As for maintenance, regularly check the oil level and quality. The high - tension oil rings are designed for great oil control, but clean oil is essential for the pistons' longevity. Also, keep an eye on the engine's performance. If you notice any unusual noises or changes in power, it might be a sign to inspect the pistons. In case you want to upgrade the wrist pins to the 9310 alloy .210' wall pins, make sure to follow the proper installation procedures.