Manley Pistons 99.50mm Bore STD Size 8.5:1 Dish Extreme Duty Subaru WRX / STI EJ257

Part #: 632200CE-4. Our new Turbo Tuff lineup for EJ25 engines makes the best aftermarket Subaru piston company even better. We've crafted the ultimate Subi piston by using design improvements from our 'Formula - Won' piston forging. It can handle high - boost and high - stress situations and runs quietly and trouble - free for daily drivers. Like all Manley Subaru pistons, these are made of 2618 alloy, have an offset wrist pin design, a skirt coating, and come with a standard 2.500' x.180' wall premium chrome moly wrist pin (P/N 42346). 9310 alloy.210' wall pin upgrades are available. Order the EXTREME DUTY part number below. These pistons come with 9310 pins (P/N 42546). Each set includes premium steel top rings, Napier style second rings, higher tension oil rings for great oil control, and round wire locks. Recommended clearances are.003' for mildly boosted and.0035' for highly boosted engines, measured.850' (79/83mm Strokes) and 1.100' (75mm Stroke) from the bottom of the oil ring groove. Manley Subaru EJ257 pistons now feature Napier style second rings and higher tension oil rings (by Total Seal) for better oil control.

Using these Manley pistons is straightforward. First, make sure to check the recommended clearances based on your engine's boost level. For mildly boosted engines, aim for.003' clearance, and for highly boosted ones,.0035' clearance measured at the specified distances from the bottom of the oil ring groove. When installing, be gentle with the components like the wrist pins and rings. The 9310 alloy pins in the extreme - duty version offer great durability, so handle them with care to avoid any damage. As for maintenance, regularly check the oil levels and the condition of the rings. The high - tension oil rings help with oil control, but if you notice any oil leakage or a drop in performance, it might be time to inspect the pistons and rings. Keep the engine clean to prevent debris from getting into the piston area. If you're planning to upgrade the pins, make sure to follow the proper procedures to ensure a smooth fit and optimal performance.