Manley EJ25 Extreme Duty Turbo Tuff Pistons 632000CE-4 99.5mm 8.5:1 WRX / STI

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About Manley EJ25 Extreme Duty Turbo Tuff Pistons

EJ25 - EXTREME DUTY PLATINUM SERIES TURBO TUFF PISTONSThese come equipped with the 9310 pins (P/N 42546). Premium steel top rings with Napier style second rings and higher tension oil rings for ultimate oil control are included with each set along with round wire locks. Recommended clearance: .003" for mildly boosted and .0035" for highly boosted measured .850" (79/83mm Strokes) and 1.100" (75mm Stroke) from the bottom of the oil ring groove.Forging2618 alloy for maximum high temperature strength and fatigue resistance.AttributesContour forgings provide the optimum balance between strength and weight with no grain-interrupting internal milling. Proprietary multi-step top ring groove machining process assures optimum control of the groove's size, geometry, flatness, and finish. All final turning is performed in one fixturing resulting in complete squareness of rings to the cylinder wall. Federal Form-Scan gauging validates ideal skirt indexing to pinhole and skirt-to-skirt polarity. Added features such as a pressure balance groove included in all series. Precise pinhole machining results in an exact compression distance as well as precise lock ring groove spacing, size, and concentricity.Manley Sport Compact Platinum series pistons come complete with pistons, rings, pins, and locksSpecifications75mm De-Stroked (2.35L) Bore Size (mm): 99.5 Over Size: STD Rod Length: 5.137" Comp. Distance: 1.285" Dome Volume (cc): -18 Cylinder Head (cc): 51 Comp. Ratio: 8.5 Piston Type: Dish Piston Wt / Gms: 439 Included Ring Set: 46995-4