What is the advantage of forged pistons over cast pistons?

Forged pistons, like these from Manley, are made from a solid block of alloy that is heated and hammered into shape. This process creates a much stronger and more durable piston compared to cast pistons, which are poured into a mold. This makes forged pistons ideal for high-performance and high-stress engine applications.

What is the purpose of the dish in the piston crown?

The -17cc dish in the piston crown is designed to reduce the compression ratio of the engine. This is particularly important for turbocharged or supercharged (boosted) engines, as it helps prevent detonation or 'knocking' by lowering the pressure and temperature inside the cylinder before ignition.

What is included in this piston set?

This Manley Platinum Series piston set includes four pistons, four sets of piston rings, and the necessary tool steel wrist pins for installation. It is designed to be a complete set for rebuilding your EJ257 engine's short block.

Specifications

Brand: Manley Performance
Part #: 612205C-4
UPC: 807298107899

Manley Subaru EJ257 100mm +.50mm Bore 8.5:1 -17cc Dish Platinum Series Piston Set with Rings

Name: Manley Subaru EJ257 100mm +.50mm Bore 8.5:1 -17cc Dish Platinum Series Piston Set with Rings
Brand: Manley Performance
SKU: manley-performance-manley-subaru-ej257-100mm-50mm-bore-8-5-1-17cc-dish-platinum--t14-483427
Price: 758.81 USD
Availability: BackOrder

$758.81

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 forged piston set. 100mm bore, 8.5:1 CR, -17cc dish. For serious engine builds.

Key Features

Fits Subaru EJ257 engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features proven cam and barrel skirt profiles to reduce friction and wear.
Exacting ring lands and grooves enhance piston ring seal for improved power.
Includes durable tool steel wrist pins.
100mm bore with a +.50mm oversize.

This piston set is designed for Subaru EJ257 engines. Please verify the specific bore and compression ratio requirements for your engine build.

⚠️ 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

When you're rebuilding the heart of your Subaru EJ257 engine, choosing the right pistons is critical for both power and longevity. This Manley Platinum Series piston set is built for those who demand serious performance and reliability from their build. These aren't just replacement parts; they're a significant upgrade designed to handle the stresses of a performance engine.

Manley uses domestic 2618 alloy forgings for these pistons, which offers a strong foundation for high-horsepower applications. They feature proven cam and barrel skirt profiles that help reduce friction and wear on your cylinder walls while still generating substantial power. The ring lands and grooves are machined to exacting standards, which is key for getting a good seal from your piston rings, leading to more efficient combustion and better power output. You also get tool steel wrist pins included, adding to the overall durability of the assembly.

This set is specifically sized at 100mm bore with a +.50mm oversize and features a -17cc dish to achieve an 8.5:1 compression ratio, making them suitable for boosted applications where lower compression is needed. The set includes the necessary piston rings to get your engine back together. Keep in mind that these pistons are not CARB approved and cannot be shipped to California.