Mahle Motorsport GM 6.6L Duramax Piston Set 4.055 in. Bore 16.3:1 Valve Pockets
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Regular price
$1,932.52
Verified Fitment & Application Support
This product is selected for proper fitment and compatibility with the listed engine application. Our team is available to assist with fitment questions, installation considerations, and supporting components to ensure a smooth install and reliable performance.
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Compliance & Restrictions
California Proposition 65 (Prop 65)
WARNING: This product can expose you to chemicals which is known to the State of California to cause cancer and/or reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
CARB / California Emissions Compliance
This item may be restricted in California and other regions with emissions regulations. If applicable, it is intended for
competition/off-road use only unless otherwise stated. It is the customer’s responsibility to confirm local compliance before purchase.
Orders shipping to restricted areas may be canceled.
Machined to a 4.055 in. bore, these Mahle Motorsport Duramax pistons pair a revised crown with a performance bowl and a coated skirt.
Key Features
- M142 cast performance piston with a coated skirt
- Bore: 4.055 in. | Stroke: 3.898 in. | Rod: 6.417 in
- Crown volume -41.8cc for a 16.3:1 compression ratio
- Compression height 1.951 in., reduced 0.010 in. from stock
- Revised casting with improved crown geometry and a performance bowl design
- 0.075 in. deep valve pockets for added valve clearance
- 4055MDK-D ring set included
- Listed weight: 861 grams each
- Sold as a set of eight pistons
Fitment
- GM 6.6L Duramax V8 diesel, LB7, LLY, LBZ, LMM, LGH and LML engine codes (2001-2016)
- 4.055 in. bore
Product Details
- Manufacturer Part Number: 930029855
- Brand: Mahle Motorsport
- Bore: 4.055 in
- Stroke: 3.898 in
- Rod length: 6.417 in
- Compression height: 1.951 in
- Pin diameter: 1.358 in
- Crown volume: -41.8cc
- Compression ratio: 16.3:1
- Valve pockets: 0.075 in. deep
- Alloy: M142
- Weight: 861 grams
- Ring set: 4055MDK-D included
- Quantity: Set of 8
- Compression ratio calculated with 0.012 in. piston protrusion above deck and a 0.037 x 4.115 in. head gasket
Shipping Height: 6.0
Shipping Length: 16.0
Shipping Width: 12.0