What is the purpose of the thermal barrier coating on these pistons?

The thermal barrier coating (TBC) on the piston crown helps to reflect heat away from the combustion chamber. This can lead to reduced piston temperatures, improved efficiency, and better protection against detonation under high-stress conditions.

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

These Mahle pistons are cast for performance applications and feature a 16.1:1 compression ratio with a thermal barrier coating. They are well-suited for performance builds and engine upgrades where increased durability and efficiency are desired.

What does the 'Not CARB approved' note mean for shipping?

This means the piston set does not meet California Air Resources Board (CARB) emissions standards. Consequently, it cannot be legally shipped to California addresses.

Mahle GM 6.6L L5P Piston Set 197987875T

Name: Mahle MS GM 6.6L L5P 4.075in Bore 3.898in Stk 6.417in Rod -40.6cc 16.1 CR w/Thermal Barrier Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-gm-6-6l-l5p-4-075in-bore-3-898in-stk-6-417in-rod-40-6cc-16-1-cr-w-t14-848315
Price: 2049.20 USD
Availability: BackOrder

Mahle MS GM 6.6L L5P 4.075in Bore 3.898in Stk 6.417in Rod -40.6cc 16.1 CR w/Thermal Barrier Set of 8

$2049.20

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 L5P diesel engine piston set. Features thermal barrier coating and 16.1 CR.

Key Features

Fits GM 6.6L Duramax L5P diesel engines.
Set includes eight cast performance pistons.
Features a 4.075-inch bore and 3.898-inch stroke.
Designed to work with a 6.417-inch connecting rod.
Includes 1.417-inch wrist pins.
Has a compression ratio of 16.1:1 with a -40.6cc dish volume.

These Mahle pistons are designed for GM 6.6L Duramax 407 cu in diesel engines. Please verify fitment 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

This is a set of Mahle MS pistons specifically made for the GM 6.6L Duramax L5P diesel engine. These pistons are designed for performance applications, featuring a 4.075-inch bore and a 3.898-inch stroke, working with a 6.417-inch connecting rod. The set includes eight pistons, each weighing 940 grams, and they come with a 1.417-inch pin diameter.

What sets these pistons apart is their construction and features aimed at improving performance and durability in demanding conditions. They have a compression ratio of 16.1:1 and a dish volume of -40.6cc, which is important for tuning your engine's combustion. A notable feature is the thermal barrier coating (TBC) applied to the piston crown. This coating helps to reflect heat away from the piston, reducing temperatures in the combustion chamber and potentially increasing efficiency and preventing detonation under high loads. The pistons are cast for performance, offering a solid foundation for rebuilding or upgrading your L5P Duramax engine.

When installing these pistons, remember they are designed for a specific engine configuration and require precise assembly. It's important to consult your engine's service manual for correct installation procedures, including ring gap settings and bearing clearances. Please note that this piston set is not CARB approved and cannot be shipped to California. It also carries a Prop 65 warning.