Manley Subaru EJ257 99.5 Grade A Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)

06-14 WRX / 04+ STi Grade A Platinum Series Piston - Single by Manley Performance

Manley pistons are machined of high strength 2618 material. Each design is lightweight yet robust enough to deliver long service life. Perfect ring groove to skirt squareness is achieved through our unique "one fixturing" manufacturing method that assures maximum horsepower. Round wire locks, tool steel wrist pins, and rings are included with every set at no additional charge.

Features

• Pin: Standard .180" Wall
• Bore Size: 99.5mm (Grade A)
• Rod Length: 5.137"
• Stroke: 79mm Standard Stroke (2.5L)
• Comp Distance: 1.209"
• Dome Volume: -17 cc
• Cylinder Head cc: 57
• Compression Ratio: 8.5:1
• Piston Type: Dish
• Weight: 411 Grams
• Ring Set: 46995DT‑1

Benefits

• "Contour 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.
• Value - 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.
• Thicker Skirt Wall
• Increased Corner Cross Sections
• Outboard Pin Bosses
• Offset wrist pin for quiet start-ups

Please Note: 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.)

Applications

• 2006-2014 Subaru WRX
• 2004-2020 Subaru WRX STi

What's In The Box?

• 1 - Piston
• 1 - Piston Ring Set
• 1 - Wrist Pin
• 1 - Spiral Lock

Warranty

• Manley products, due to their intended use, are sold without warranty.