What is the primary benefit of using forged aluminum pistons like these?

Forged aluminum pistons are stronger and more durable than cast pistons. This makes them better suited to handle the higher pressures and temperatures found in high-performance or heavily modified diesel engines, offering improved reliability under demanding conditions.

What is the compression ratio achieved with this piston set?

This Mahle piston set is designed to achieve a 16.3:1 compression ratio when used with the specified stroke, rod length, and bore size. This is a common target for performance-oriented Duramax builds.

Are these pistons compatible with all Duramax engines?

These pistons are specifically designed for the GM 6.6L Duramax 403 cu in engine. It is important to verify that your specific engine model and configuration match the specifications, including stroke and rod length, before purchasing.

Mahle Duramax Piston Set 930036255

Name: Mahle MS Piston Set Duramax 4.055in Bore 3.898in Stk 6.417in Rod 1.358 Pin -41.8cc 16.3 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-duramax-4-055in-bore-3-898in-stk-6-417in-rod-1-358-pin-t14-30109
Price: 2974.89 USD
Availability: BackOrder

Mahle MS Piston Set Duramax 4.055in Bore 3.898in Stk 6.417in Rod 1.358 Pin -41.8cc 16.3 CR Set of 8

$2974.89

On Backorder

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

Mahle MS Piston Set for GM 6.6L Duramax. Forged aluminum construction for high-performance builds.

Key Features

Fits GM 6.6L Duramax 403 cu in engines.
Set includes eight forged aluminum pistons.
Features a 4.055-inch bore and a -41.8cc dish volume.
Designed for a 3.898-inch stroke and 6.417-inch connecting rod.
Includes 1.358-inch wrist pins.
Achieves a 16.3:1 compression ratio.

This piston set is designed for GM 6.6L Duramax 403 cu in engines. Please verify compatibility with your specific vehicle and engine configuration.

⚠️ 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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Product Details

If you're building a high-performance GM 6.6L Duramax engine, this Mahle MS Piston Set is a solid choice. These pistons are forged from aluminum, which makes them strong and lightweight, ideal for engines that will see heavy use or require increased power. The set includes eight pistons, each with a 4.055-inch bore and a -41.8cc dish volume, contributing to a 16.3:1 compression ratio. This specific configuration is designed for a 3.898-inch stroke and a 6.417-inch connecting rod, with a 1.358-inch pin diameter.

Mahle is a well-known name in engine components, and these pistons reflect that reputation. The forged aluminum construction offers improved durability over cast pistons, allowing them to handle higher cylinder pressures and temperatures often found in modified diesel engines. The precise machining and design details, like the specific dish volume and pin size, are crucial for achieving optimal performance and reliability in your Duramax build. Each piston weighs in at 774 grams, which is a notable weight for a forged diesel piston of this size.

This piston set is intended for serious engine builds and is not CARB approved, meaning it cannot be shipped to California. Ensure you check all manufacturer specifications and consult with your engine builder to confirm compatibility with your specific application and other engine components before installation.