Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.55mm +.05mm Bore 8.5:1 Dish Piston/Ring Set - SINGLE

612001C-1

Manley pistons are machined of high strength 2618 material. Each design is lightweight yet robust enough to deliver long service life. Offset wrist pin design is utilized for quiet start-ups. Perfect ring groove to skirt squareness is achieved through our unique "one fixturing" manufacturing method that assures maximum horsepower. All pistons come with moly coated skirts. Round wire locks, premium chrome moly wrist pins, and premium steel top ring sets from Total Seal are included with every kit at no additional charge. 9310 alloy upgraded wrist pins are available. 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.

Specifications (79mm STD Stroke 2.5L):

• Bore Size (mm): 99.55
• Over Size: +.05mm
• Rod Length: 5.137"
• Stroke (mm): 79
• Comp. Distance: 1.209"
• Dome Volume (cc): -22
• Cylinder Head (cc): 51
• Comp. Ratio: 8.5
• Piston Type: Dish
• Pistons Wt / Gms: 395
• Premium Steel Top Rings: 46995DT-4

Fitment:

• Subaru WRX Sti 2004 up - EJ257 .9055"/23mm x 2.500" Pin x .210" Wall

Notes:

• Sold individually 

  Make	Model	Submodel	Year	Engine	Notes
  Subaru	STI		2004-2022