What is the purpose of the 8.5:1 dish volume?

The 8.5:1 dish volume is a specific design choice for DE-stroker engine configurations. It helps to achieve a balanced compression ratio when used with the appropriate crankshaft and connecting rods, which is crucial for boosted applications.

What are the benefits of the cam and barrel skirt profiles?

These profiles are engineered to minimize friction and wear on the cylinder walls during engine operation. While reducing wear, they are also designed to help generate substantial power by optimizing the piston's movement within the cylinder.

Are these pistons compatible with all EJ257 engines?

This piston set is specifically designed for 2004 and later Subaru WRX and STI models with the EJ257 engine. It is important to confirm that your engine build aligns with the 99.5mm bore and 8.5:1 dish volume specifications for optimal performance.

Specifications

Brand: Manley Performance
Part #: 632000C-4
UPC: 807298089263

Manley 04+ Subaru WRX/STi (EJ257) 75mm DE-Stroker 99.5mm STD Size Bore 8.5:1 Dish Piston Set

Name: Manley 04+ Subaru WRX/STi (EJ257) 75mm DE-Stroker 99.5mm STD Size Bore 8.5:1 Dish Piston Set
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-75mm-de-stroker-99-5mm-std-siz-t14-4339029
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley 04+ Subaru WRX/STi (EJ257) 99.5mm STD bore forged piston set with 8.5:1 dish. Built for high performance.

Key Features

Fits 2004+ Subaru WRX/STI with EJ257 engine.
99.5mm standard bore size.
8.5:1 dish volume for DE-stroker builds.
Constructed from domestic 2618 alloy forgings for superior strength.
Features Manley's proven cam and barrel skirt profiles for reduced wear and improved power.
Includes premium chrome moly wrist pins.

This piston set is designed for 2004 and later Subaru WRX and STI models equipped with the EJ257 engine. It is not CARB approved and cannot be shipped to California.

⚠️ 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

Built from domestic 2618 alloy forgings, these Manley pistons are a strong choice for anyone rebuilding or significantly upgrading their 2004 and later Subaru WRX or STI with the EJ257 engine. The 99.5mm standard bore size and 8.5:1 dish volume are specifically chosen to work with the DE-stroker configuration, helping to achieve a balanced compression ratio for boosted applications.

Manley's signature cam and barrel skirt profiles are designed to reduce friction and wear on your cylinder walls while still generating substantial power. They also use unique fixturing that allows them to machine the skirt and ring grooves in one operation, ensuring the ring grooves stay perfectly square to the skirt. This attention to detail means you get a better ring seal, which translates directly to more power and improved engine efficiency. The pistons come standard with premium chrome moly wrist pins, and Manley's exacting standards for ring lands and grooves further contribute to a solid seal.

This set is intended for serious engine builds and is not CARB approved, meaning it cannot be shipped to California. If you're looking for a well-built, high-performance piston set for your EJ257, these Manley pistons are a popular choice among professional engine builders for their durability and performance characteristics.