What is the compression ratio of these pistons?

These pistons feature a dish design that results in a compression ratio of 8.5:1. This is often preferred for turbocharged or supercharged applications to help manage cylinder pressures.

What is included with this piston set?

This set includes four pistons, the necessary wrist pins, and a set of piston rings. You will need to have your engine cylinders bored to 87mm to accommodate these over-bore pistons.

Are these pistons suitable for a stock engine rebuild?

These are forged pistons with a specific compression ratio and over-bore size, typically used in performance-oriented engine builds or rebuilds. For a stock rebuild, you would generally use cast or hypereutectic pistons at the standard bore size.

Specifications

Brand: Manley Performance
Part #: 606020C-4
UPC: 807298074627

Manley 03-06 Evo 8/9 (7 Bolt 4G63T) 87mm +2mm Over Bore 8.5:1 Dish Pistons w/ Rings

Name: Manley 03-06 Evo 8/9 (7 Bolt 4G63T) 87mm +2mm Over Bore 8.5:1 Dish Pistons w/ Rings
Brand: Manley Performance
SKU: manley-performance-manley-03-06-evo-8-9-7-bolt-4g63t-87mm-2mm-over-bore-8-5-1-di-t14-260410
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 87mm +2mm over bore forged pistons for 03-06 Evo 8/9 (7 Bolt 4G63T). 8.5:1 dish compression ratio with rings.

Key Features

Fits 1993-1999 Mitsubishi Eclipse, 1993-1994 Plymouth Laser, 1995 Mitsubishi Expo, 1995-1999 Mitsubishi Galant, 2003-2006 Mitsubishi Lancer, 1995-1996 Mitsubishi Mighty Max, and 1997-1999 Mitsubishi Montero Sport.
Set includes four 87mm +2mm over bore pistons with a dish design for 8.5:1 compression ratio.
Constructed from domestic 2618 alloy forgings for superior strength and performance.
Features tool steel wrist pins and moly skirt coatings for added durability and reduced friction.
Cam and barrel skirt profiles are designed to optimize power output while protecting cylinder walls.
Exacting standards for ring lands and grooves ensure enhanced ring seal and power.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

About this part

Product Details

When you're rebuilding the heart of your performance vehicle, you want parts you can trust. This set of Manley 87mm +2mm over bore pistons is built for the 7-bolt 4G63T engine found in models like the 2003-2006 Mitsubishi Lancer, as well as earlier DSM platforms such as the 1993-1999 Mitsubishi Eclipse and Eagle Talon. These pistons feature a dish design to achieve an 8.5:1 compression ratio, making them a solid choice for boosted applications where you need to control detonation. You get a complete set of pistons, each with tool steel wrist pins and a moly skirt coating for improved durability and reduced friction.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to handle the demands of high-performance engines. The cam and barrel skirt profiles are carefully designed to generate significant power while also being gentle on your cylinder walls, helping to maintain engine longevity. Manley's manufacturing process ensures that the ring lands and grooves are machined to exacting standards, which is crucial for achieving a good seal and maximizing power output. The unique fixturing they use allows for skirt turning and ring groove machining in a single operation, ensuring the ring grooves stay perfectly square to the skirt, a detail that matters for consistent performance.

This set includes the pistons, wrist pins, and rings needed to get your engine back together. Because these are an over-bore piston, you'll need to ensure your cylinders are machined to the correct 87mm size. Always refer to the manufacturer's installation instructions for precise measurements and assembly procedures.