Specifications
- Brand
- Mahle
- Part #
- 197987895T

Mahle MS GM 6.6L L5P 4.095in Bore 3.898in Stk 6.417in Rod -40.6cc 16.2 CR w/Thermal Barrier Set of 8
$2049.20
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Mahle GM 6.6L L5P cast performance piston set. Includes thermal barrier coating for improved durability.
Key Features
- Set of 8 cast performance pistons for GM 6.6L Duramax L5P engines.
- Designed for a 4.095-inch bore with a 3.898-inch stroke and 6.417-inch rod.
- Features a thermal barrier coating (TBC) on the piston crown to reduce combustion chamber temperatures.
- Each piston weighs 954g.
- Compression ratio of 16.2:1 with a -40.6cc dish volume.
- Not CARB approved; cannot ship 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
Product Details
Mahle is well-known for their engine components, and this set of cast performance pistons for the GM 6.6L Duramax L5P engine is a prime example of their expertise. If you're rebuilding the heart of your diesel truck, these pistons are built to handle the demands of a performance-oriented engine. They are designed for a 4.095-inch bore and feature a 3.898-inch stroke with a 6.417-inch rod, all contributing to the engine's overall performance and efficiency.
What sets these pistons apart is the inclusion of a thermal barrier coating (TBC). This advanced coating helps to reflect heat away from the piston crown, reducing temperatures inside the combustion chamber. This not only contributes to improved durability under heavy loads but also helps maintain optimal combustion temperatures, which can lead to better overall engine performance. Each piston weighs in at 954g and has a compression ratio of 16.2:1, with a dish volume of -40.6cc, all carefully engineered for the L5P platform.
This set includes eight pistons, ensuring you have everything needed for a complete engine overhaul. Please 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.
Specifications
- Brand
- Mahle
- Manufacturer Part #
- 197987895T
Frequently Asked Questions
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Mahle MS GM 6.6L L5P 4.095in Bore 3.898in Stk 6.417in Rod -40.6cc 16.2 CR w/Thermal Barrier Set of 8




