What is the compression ratio with these pistons?

These pistons feature a dish volume of -40.6cc, which results in a 16.1 compression ratio when installed in the GM 6.6L Duramax L5P engine. This is designed for improved combustion efficiency and power.

Are these pistons suitable for a stock engine rebuild?

While these are cast performance pistons, their specifications like the compression ratio and dish volume are geared towards enhanced performance. It's recommended to consult with your engine builder to confirm they align with your specific rebuild goals, especially if you are not modifying the engine for increased power.

What does 'Not CARB approved' mean for shipping?

This means the pistons do not meet the emissions standards set by the California Air Resources Board (CARB). As a result, they cannot be legally shipped to California due to emissions regulations.

Mahle GM 6.6L Duramax L5P Piston Set 197987875

Name: Mahle MS GM 6.6L Duramax L5P 4.075in Bore 3.898in Stk 6.417in Rod 1.417 Pin -40.6cc 16.1 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-gm-6-6l-duramax-l5p-4-075in-bore-3-898in-stk-6-417in-rod-1-417-pi-t14-832708
Price: 1779.51 USD
Availability: BackOrder

Mahle MS GM 6.6L Duramax L5P 4.075in Bore 3.898in Stk 6.417in Rod 1.417 Pin -40.6cc 16.1 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. Part# 197987875.

Key Features

Set of 8 cast performance pistons for GM 6.6L Duramax L5P engines.
Features a 4.075-inch bore and 3.898-inch stroke.
Includes 6.417-inch connecting rod length and 1.417-inch pin diameter.
Pistons weigh 940 grams each.
Dish volume of -40.6cc results in a 16.1 compression ratio.
Designed for improved combustion efficiency and power output.

These pistons are designed for GM 6.6L Duramax 407 cu in. engines. Please verify compatibility with your specific vehicle application.

⚠️ 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

Mahle is a well-known name in engine components, often recognized for their OE-quality parts and performance-oriented aftermarket solutions. This set of cast performance pistons is built for the GM 6.6L Duramax L5P engine, a powerhouse found in many heavy-duty trucks. If you're rebuilding the top end of your Duramax or looking to improve its performance, these pistons are designed to handle the demands of a modified or high-performance diesel engine.

This piston set features a 4.075-inch bore and a 3.898-inch stroke, with a 6.417-inch connecting rod length and a 1.417-inch pin diameter. The pistons themselves weigh 940 grams and have a dish volume of -40.6cc, which results in a 16.1 compression ratio. This specific configuration is geared towards enhanced combustion efficiency and power output, making them a solid choice for engine builds aiming for improved performance. The cast construction offers a good balance of strength and weight for many applications.

This set includes eight pistons, enough for a complete engine rebuild. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always a good idea to consult with your engine builder or a trusted mechanic to ensure these pistons are the right fit for your specific build goals and to review the manufacturer's installation instructions, especially regarding ring gap and assembly.