MANLEY PLATINUM SERIES Standard Piston [Bore Size mm 99.50 Grade B | Over Size STD | Rod Length 5.137" | Comp Distance 1.209" | Dome Volume (cc) -17 | Cylinder Head (cc) 57 | Comp Ratio 8.5 | Piston Type Dish | Piston Wt/Gms 417] (SUBARU EJ257)

2618 high strength material
Offset wrist pin for quiet start-ups
2.500" x .180" wall Premium Chrome Moly pin (Standard Series) included P/N 42346
9310 alloy .250" wall pin (Extreme Duty Series) included P/N 42547
Pressure balance groove
Will accommodate +1mm valve sizes
Premium Steel top rings with Napier seconds and round wire locks included
Recommended piston clearance: .003" for mildly boosted and .0035" for highly boosted measured .850" (79/83mm stroke) and 1.100" (75mm stroke) from the bottom of the oil ring

Pistons include Napier style second rings and higher tension oil rings for improved oil control

These pistons feature skirt diameters that correspond to the OEM Grade A or B bores resulting in a piston to wall clearance range of .0023" - .0031". Check the bore grades on the top of your block and order the appropriate quantities of Grade A or B pistons. (Sold as -1 individual pieces, not sets.)

79mm STD STROKED (2.5L)