What is the advantage of the 8.5:1 compression ratio dish piston?

The 8.5:1 dish piston is designed for boosted engines, like those with turbochargers. This lower compression ratio helps prevent detonation or 'knocking' under high boost pressures, allowing for more aggressive tuning and power output.

What does the +0.5mm overbore mean for my engine?

The +0.5mm overbore means these pistons are slightly larger than the original stock pistons. This is typically used when an engine block needs to be machined to correct imperfections or wear in the cylinder walls, allowing for a fresh bore and optimal piston fit.

Are these pistons compatible with all piston rings?

This set comes with specific rings designed for these pistons. While aftermarket rings might be available, it's generally recommended to use the rings that come with the set or those specifically listed as compatible by Manley Performance to ensure proper fit and seal.

Specifications

Brand: Manley Performance
Part #: 606005CE-4
UPC: 807298088709

Manley 03-06 Evo 8/9 (7 Bolt 4G63T) 85.5mm +0.5mm Over Bore 8.5:1 Dish Pistons w/ Rings *Extreme

Name: Manley 03-06 Evo 8/9 (7 Bolt 4G63T) 85.5mm +0.5mm Over Bore 8.5:1 Dish Pistons w/ Rings *Extreme
Brand: Manley Performance
SKU: manley-performance-manley-03-06-evo-8-9-7-bolt-4g63t-85-5mm-0-5mm-over-bore-8-5--t14-4358527
Price: 893.77 USD
Availability: BackOrder

$893.77

On Backorder

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

Manley Performance forged pistons for 03-06 Evo 8/9 (7 Bolt 4G63T). 85.5mm bore, 8.5:1 dish. For extreme builds.

Key Features

Fits 2003-2006 Mitsubishi Lancer Evolution 8/9 (7 Bolt 4G63T).
85.5mm bore size (+0.5mm overbore).
8.5:1 compression ratio dish pistons.
Constructed from strong 2618 alloy forgings.
Includes durable tool steel wrist pins.
Features cam and barrel skirt profiles for reduced friction and wear.

These pistons are designed for the 2003-2006 Mitsubishi Lancer Evolution 8 and 9 models with the 7-bolt 4G63T engine. They are 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

When you're rebuilding the engine in your 2003-2006 Mitsubishi Lancer Evolution 8 or 9, especially for high-performance applications, choosing the right pistons is critical. These Manley Performance pistons are designed for the 7-bolt 4G63T engine and come in a 85.5mm bore size, which is a +0.5mm overbore from stock. The 8.5:1 compression ratio dish design is well-suited for boosted applications where you need to control detonation.

Manley uses their signature 2618 alloy forgings for these pistons, which are known for their strength and ability to handle the stresses of demanding engine builds. 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 strict standards, which is key for ensuring a good seal with your piston rings, leading to better compression and more power. These pistons also include tool steel wrist pins for added durability, and the unique fixturing Manley uses allows for precise machining of the ring grooves and skirt in one operation, ensuring they are perfectly square to each other.

This set includes the pistons and rings. Remember that these pistons are not CARB approved and cannot be shipped to California. If you're building a serious performance engine, these Manley pistons are a solid choice for reliability and power.