What is the compression ratio with this piston?

This piston features a -17cc dish, which results in an 8.5:1 compression ratio when used in the specified Subaru EJ257 application. This is lower than stock, often chosen for forced induction builds.

What material is the wrist pin made from?

This piston comes standard with a premium Chrome Moly wrist pin. Manley also offers upgrades to 9310 and Turbo Tuff/DLC alloys for select part numbers, providing additional durability.

Can this piston be shipped to California?

No, this piston is not CARB approved and cannot be shipped to California. Please check local regulations for engine component compliance.

Specifications

Brand: Manley Performance
Part #: 612200CA-1
UPC: 807298107820

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

Name: Manley Subaru EJ257 99.5 Grade A Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Brand: Manley Performance
SKU: manley-performance-manley-subaru-ej257-99-5-grade-a-bore-8-5-1-17cc-dish-platinu-t14-223126
Price: 204.36 USD
Availability: BackOrder

$204.36

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Subaru EJ257 99.5mm Platinum Series Piston. Forged from 2618 alloy for improved strength and durability in performance builds.

Key Features

Fits Subaru EJ257 engines with a 99.5mm bore.
Platinum Series piston forged from domestic 2618 alloy for strength.
Features a -17cc dish for an 8.5:1 compression ratio.
Includes cam and barrel skirt profiles for power and cylinder wall protection.
Exacting ring lands and grooves promote enhanced ring seal.
Comes with a premium Chrome Moly wrist pin.

This piston is designed for Subaru EJ257 engines with a 99.5mm bore. Always confirm compatibility with your specific engine build and consult manufacturer documentation.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the engine in your Subaru EJ257, this Manley Platinum Series piston is a solid option. It's a single forged piston designed for a 99.5mm bore with a -17cc dish, resulting in an 8.5:1 compression ratio. Manley uses domestic 2618 alloy forgings, which are known for their strength and ability to handle demanding conditions, making them a popular choice among professional engine builders.

These pistons feature proven cam and barrel skirt profiles that help generate power while being gentle on your cylinder walls. The ring lands and grooves are machined to strict standards, which helps ensure a good seal for improved performance. Manley also uses unique fixturing to machine the skirt and ring grooves in one operation, ensuring they are perfectly square to each other. This level of precision matters for consistent engine operation.

This piston comes with a premium Chrome Moly wrist pin. Keep in mind that this part is not CARB approved and cannot be shipped to California. It's always a good idea to refer to the manufacturer's installation instructions for specific details on fitting these pistons during your engine build.