What is the compression ratio with these pistons?

These Mahle pistons are designed to achieve a 16.0:1 compression ratio. This is achieved through the specific dish volume of -41.2cc combined with the engine's other components.

Are these pistons suitable for a stock replacement or performance build?

These are cast performance pistons, making them a solid option for engine rebuilds where improved performance is a goal. Their specifications are tailored for the GM 6.6L Duramax L5P engine.

Can these pistons be shipped to California?

No, these pistons are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle GM 6.6L Duramax L5P Piston Set 197987995

Name: Mahle MS GM 6.6L Duramax L5P 4.095in Bore 3.898in Stk 6.417in Rod 1.417 Pin -41.2cc 16.0 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-gm-6-6l-duramax-l5p-4-095in-bore-3-898in-stk-6-417in-rod-1-417-pi-t14-832706
Price: 1978.43 USD
Availability: BackOrder

Mahle MS GM 6.6L Duramax L5P 4.095in Bore 3.898in Stk 6.417in Rod 1.417 Pin -41.2cc 16.0 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 GM 6.6L Duramax L5P cast performance piston set. For 411 cu in engines. Not CARB approved.

Key Features

Fits GM 6.6L Duramax L5P 411 cu in engines.
Features a 4.095-inch bore and 3.898-inch stroke.
Includes a 1.417-inch pin and 6.417-inch rod length.
Achieves a 16.0:1 compression ratio with a -41.2cc dish volume.
Each piston weighs 956 grams.
Cast construction for a balance of strength and weight.

This piston set is designed for GM 6.6L Duramax 411 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

These Mahle cast performance pistons are built for the GM 6.6L Duramax L5P engine, featuring a 4.095-inch bore and a 3.898-inch stroke. The pistons themselves have a compression height of 2.122 inches, utilizing a 1.417-inch pin and a 6.417-inch rod length. This combination is designed to achieve a 16.0:1 compression ratio with a dish volume of -41.2cc, contributing to the overall 411 cubic inch displacement of the engine. Each piston weighs in at 956 grams, indicating a well-built component suitable for demanding applications.

Mahle has engineered these pistons with a focus on performance and reliability for the Duramax L5P platform. The cast construction offers a solid balance of strength and weight, making them a popular choice for engine rebuilds where improved performance is desired. The specific dimensions and compression ratio are carefully matched to the L5P's operational characteristics, ensuring efficient combustion and power delivery. This set includes all eight pistons needed to rebuild your engine's core.

When undertaking an engine rebuild of this caliber, it's important to ensure all supporting components are up to the task. While these pistons are a significant upgrade, consider the condition of your crankshaft, connecting rods, and cylinder heads. Proper balancing and machining are crucial for optimal performance and longevity. Please note that these pistons are not CARB approved and cannot be shipped to California.