Manley Tuff Extreme Forged Pistons WRX STI EJ257 83mm Stroker 100mm -14 cc 9.2:1

Back Ordered


Manley Turbo Tuff Extreme Forged Pistons for WRX EJ255 STI EJ257 83mm Stroker 100mm 9.2:1

The best aftermarket Subaru piston company just got even better with our new Turbo Tuff lineup targeted specifically for EJ25 engines. By incorporating proven design enhancements from our "Formula-Won" piston forging, we've created the ultimate Subi piston to withstand the rigors of the highest boosted and stressed applications yet still run "quietly" and trouble-free for the daily driver. Like all Manley Subaru pistons, these are made from 2618 alloy, utilize an offset wrist pin design, are skirt coated and include our 9310 alloy 2.500" x .250" wall pins (P/N 42547). 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.

Manley Subaru EJ257 pistons now include Napier style second rings and higher tension oil rings (by Total Seal) for superior oil control.


More Information
Item Weight 428 g
Shipping Weight (Dimensional) 5.000000
Clearance Sale No
Availability Back Ordered
Part Type Pistons
Make Subaru
Vehicle Model Impreza WRX STi
Model STi 04-07 GD, STi 08-14 GR, STi 15+ VA
Engine EJ257, EJ257B
Rod Length 5.137" / 130.5mm
Rod Length Oversize Standard Length
Bore Diameter 100mm
Bore Oversize 0.020" / 0.5mm
Stroke 83mm (2.7L Stroker)
Compatible with Stock Sleeves Yes
Requires Aftermarket Sleeves No
Compression Ratio 9.2:1
Compression Ratio Range 9.0:1 - 10.0:1
Pin Size 0.905" / 23mm
Included Ring Set 461000DT-4
Included Pin 42547-4
Head cc 57 cc
Face Type Dish
Dome cc -14 cc
Compression Height 1.130" / 28.7mm
Piston Coating Skirt Coating
Brand Manley Performance
Skirt Type Full Round
Piston Material 2618
Carb Legal Unspecified
Wrist Pin Wall Thickness 0.210"
Wrist Pin Dimensions .905" x 2.500" x .250"
Pin Material 9310 Steel


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