Manley 8.5 Comp Ratio / -17cc / +.25mm Oversize Turbo Tuff Stock Stroke Pistons | 2004-2019 Subaru STI (632802C-4)

Subaru EJ257 Turbo Tuff Pistons by Manley Performance

Specifically designed for the enthusiast seeking nothing but the absolute best of the best, Manley Performance Turbo Tuff pistons deliver everything and more! Manley Performance has engineered and manufactured their pistons for the most demanding environments.

High strength 2618 alloy forgings, material in the correct places supporting proper cross sectional thickness in the highest stressed and critical areas, machined struts, the right ring stack and ring package with premium steel tops and Napier seconds, valve pockets to accommodate +1mm oversize valves, coated skirts and vertical gas ports all contribute in making these the ultimate pistons.

Features

• 2618 high strength material
• Offset wrist pin for quiet start-ups
• 2.500 x .180 wall Premium Chrome Moly pin
• 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

Applications

• 2004 – 2019 Subaru STI

Specifications

• Bore Size: 99.75mm (+.25mm Over)
• Rod Length: 5.137″
• Comp Distance: 1.209″
• Dome Volume (cc): -17cc
• Cylinder Head (cc): 57cc
• Comp Ratio: 8.5
• Piston Type: Dish
• Piston Weight: 421g

What’s In The Box?

• 1 – Turbo Tuff Piston Set
• Piston Rings and Pins

Warranty

• Manufacturer Standard Warranty