Manley Pistons 99.75mm +.25mm Bore 9.8:1 Dish Extreme Duty Subaru WRX / STI EJ257

Part #: 632302CE - 4. Our new Turbo Tuff lineup from the top aftermarket Subaru piston company is specially designed for EJ25 engines. By using design improvements from our 'Formula - Won' piston forging, we've crafted the ideal Subaru piston. It can handle high - boost and high - stress situations, yet runs smoothly and trouble - free for daily drivers. Like all Manley Subaru pistons, these are made of 2618 alloy, feature an offset wrist pin design, have a 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. Just order the EXTREME DUTY part number. These pistons come 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 clearances are.003' for mildly boosted engines 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 have Napier style second rings and higher tension oil rings (by Total Seal) for better oil control.

Using these Manley pistons in your Subaru WRX/STI EJ257 is straightforward. First, make sure you order the right part number. If you need high - performance, go for the EXTREME DUTY option which comes with 9310 pins. When installing, pay attention to the recommended clearances. For mildly boosted engines, use a clearance of.003', and for highly boosted ones, use.0035'. This will ensure proper fit and performance. As for maintenance, regularly check the oil control. The high - quality rings included in the set are designed to keep oil in check, but a quick inspection from time to time won't hurt. Also, keep an eye on the piston for any signs of wear. If you notice anything unusual, it might be time to consult a mechanic. And remember, these pistons are built to last, but proper care will help them perform at their best for a long time.