What is a stroker piston and why would I use one?

A stroker piston is designed to work with a crankshaft that has a longer stroke than stock, effectively increasing the engine's displacement. This generally leads to more torque and power. These Manley pistons are built with the strength needed to handle the increased forces in a stroker engine.

What does the 8.5:1 compression ratio mean for my engine?

An 8.5:1 compression ratio is considered relatively low for a naturally aspirated engine but is often ideal for turbocharged or supercharged applications. It helps prevent engine knock or detonation under boost by reducing the pressure and heat in the cylinder before ignition.

Does this piston come with rings and connecting rod?

This product listing is for a single piston only. You will need to purchase piston rings and a connecting rod separately, and in the correct quantities for your engine. Please check the product details to ensure you order the correct components for your build.

Specifications

Brand: Manley Performance
Part #: 620000C-1

Manley 98+ Subaru WRX (EJ205) 79mm +4mm Stroker 92mm STD Bore 8.5:1 Dish Piston - Single

Name: Manley 98+ Subaru WRX (EJ205) 79mm +4mm Stroker 92mm STD Bore 8.5:1 Dish Piston - Single
Brand: Manley Performance
SKU: manley-performance-manley-98-subaru-wrx-ej205-79mm-4mm-stroker-92mm-std-bore-8-5-t14-750251
Price: 189.71 USD
Availability: BackOrder

$189.71

On Backorder

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

Fits 2002-2005 Subaru Impreza. Manley forged stroker piston for improved engine performance and durability.

Key Features

Fits 2002-2005 Subaru Impreza.
Forged from 2618 alloy for strength and performance.
Dish piston design results in 8.5:1 compression ratio.
Features cam and barrel skirt profiles to reduce cylinder wall wear.
Precise ring lands and grooves for improved ring seal and power.
Includes durable chrome moly wrist pins.

⚠️ 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 2002-2005 Subaru Impreza, especially if you're looking to increase displacement with a stroker setup, these Manley pistons are a solid choice. They are designed to handle the demands of a performance engine build, offering a good balance of strength and reliability.

These pistons are forged from 2618 alloy, a strong material commonly used in performance applications. They feature a dish design that results in a compression ratio of 8.5:1, which is suitable for boosted applications where you need to control detonation. The skirt profiles are shaped to reduce friction and wear on the cylinder walls, while the precise ring lands and grooves help ensure a good seal for better power output. Manley also uses a unique machining process that ensures the ring grooves are perfectly square to the piston skirt, which is important for proper ring function.

This is a single piston, so you'll need to order the correct quantity for your engine. They come with chrome moly wrist pins, which are strong and durable for most builds. Keep in mind these are not CARB approved and cannot be shipped to California.