What is the compression ratio with these pistons?

These Mahle pistons feature a -41.2cc dish volume, which results in a 15.8:1 compression ratio when installed in the GM 6.6L Duramax L5P engine.

Are these pistons suitable for all Duramax L5P engines?

This set is specifically designed for the GM 6.6L Duramax L5P engine with a 403 cubic inch displacement. It is important to verify these specifications match your engine build.

Can these pistons be shipped to California?

No, these pistons are not CARB approved and therefore cannot be shipped to California.

Mahle GM 6.6L Duramax L5P Piston Set 197987955

Name: Mahle MS GM 6.6L Duramax L5P 4.055in Bore 3.898in Stk 6.417in Rod 1.417 Pin -41.2cc 15.8 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-gm-6-6l-duramax-l5p-4-055in-bore-3-898in-stk-6-417in-rod-1-417-pi-t14-832705
Price: 1978.43 USD
Availability: BackOrder

Mahle MS GM 6.6L Duramax L5P 4.055in Bore 3.898in Stk 6.417in Rod 1.417 Pin -41.2cc 15.8 CR Set of 8

$1978.43

On Backorder

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

Mahle cast performance piston set for GM 6.6L Duramax L5P engines. Includes 8 pistons for a 4.055in bore.

Key Features

Set includes 8 Mahle cast performance pistons.
Designed for GM 6.6L Duramax L5P engines.
Features a 4.055 inch bore and 3.898 inch stroke.
Includes a 6.417 inch rod length and 1.417 inch pin.
Piston dish volume is -41.2cc for a 15.8:1 compression ratio.
Each piston weighs approximately 927 grams.

This piston set is designed for GM 6.6L Duramax 403 cu in engines. It is 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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Product Details

This is a set of 8 Mahle cast performance pistons designed for GM 6.6L Duramax L5P engines. Each piston features a 4.055 inch bore, a 3.898 inch stroke, and a 6.417 inch rod length with a 1.417 inch pin. The piston dish volume is -41.2cc, resulting in a 15.8:1 compression ratio. These pistons weigh approximately 927 grams each and are intended for a 403 cubic inch displacement engine.

Mahle is a well-known name in engine components, and this piston set is built for performance applications. The cast construction offers a good balance of strength and weight for many builds. The specific dimensions and compression ratio are tailored for the Duramax L5P platform, aiming to improve performance over stock components. It's important to note that these pistons are not CARB approved and cannot be shipped to California.

When rebuilding or significantly modifying your Duramax L5P, choosing the right pistons is crucial for reliability and performance. This set from Mahle provides the core components for a robust engine build. Always consult with your engine builder or refer to Mahle's detailed installation guidelines to ensure proper fitment and assembly with other engine components.