What is the compression ratio for these pistons?

These Mahle pistons feature a -40.6cc dish volume, which results in a 16.2:1 compression ratio. This is an increase over the stock compression ratio and is suitable for performance applications.

Are these pistons suitable for all 6.6L Duramax engines?

This specific piston set is designed for the GM 6.6L Duramax L5P engine with a 411 cubic inch displacement. It is crucial to verify fitment for your specific engine model.

What is included in this piston set?

This is a set of eight cast performance pistons. It includes all the pistons required for a complete rebuild of the 6.6L Duramax L5P engine.

Mahle GM 6.6L Duramax L5P Piston Set 197987895

Name: Mahle MS GM 6.6L Duramax L5P 4.095in Bore 3.898in Stk 6.417in Rod 1.417 Pin -40.6cc 16.2 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-t14-832704
Price: 1779.51 USD
Availability: BackOrder

Mahle MS GM 6.6L Duramax L5P 4.095in Bore 3.898in Stk 6.417in Rod 1.417 Pin -40.6cc 16.2 CR Set of 8

$1779.51

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.
Cast performance piston set.
4.095 inch bore size.
3.898 inch stroke.
6.417 inch connecting rod length.
1.417 inch pin diameter.

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

Secure CheckoutFast Shipping631-982-0042

Product Details

Mahle's MS GM 6.6L Duramax L5P cast performance piston set is built for the 411 cubic inch engine. These pistons are designed to handle the demands of a performance diesel engine, offering a solid foundation for builds that need more than stock power. With a 4.095-inch bore and a 3.898-inch stroke, they are precisely sized for a direct fit into the L5P engine block.

Each piston in this set features a 6.417-inch connecting rod length and a 1.417-inch pin diameter, ensuring proper geometry and load distribution. The -40.6cc dish volume contributes to a 16.2:1 compression ratio, which is a notable increase over stock, making them suitable for applications looking for improved power output. Weighing in at 954 grams per piston, they are well-built for durability under increased cylinder pressures. This set includes all eight pistons needed for a complete engine rebuild.

It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures to ensure optimal performance and longevity of your engine.