What is the advantage of forged aluminum pistons over cast aluminum?

Forged aluminum pistons are made by heating and hammering aluminum into shape, creating a denser and stronger grain structure. This makes them much more resistant to heat and stress compared to cast pistons, which are poured into a mold. This increased durability is vital for high-performance diesel engines.

Are these pistons a direct replacement for all Cummins 5.9L engines?

These pistons are specifically designed for Cummins 5.9L 12V and 24V engines with a 366 cubic inch displacement and a 4.055 inch bore. It's important to verify your engine's specific configuration and displacement to ensure compatibility.

What does 'Custom Order / No Cancel' mean for this product?

This means the pistons are manufactured specifically for your order after it is placed. Because of this custom manufacturing process, the order cannot be canceled once it has been submitted, and returns are not accepted.

Mahle Cummins 5.9L Piston Set 4.055in Bore 929943055

Name: Mahle MS Piston Set Cummins 4.055in Bore 366 cid (Custom Order / No Cancel) - Set of 6
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-cummins-4-055in-bore-366-cid-custom-order-no-cancel-se-t14-862271
Price: 3265.11 USD
Availability: BackOrder

Mahle MS Piston Set Cummins 4.055in Bore 366 cid (Custom Order / No Cancel) - Set of 6

$3265.11

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle forged aluminum piston set for Cummins 5.9L 366 cid engines. 4.055in bore. Custom order.

Key Features

Fits Cummins 5.9L 12V/24V engines with 366 cubic inch displacement.
Features a 4.055 inch bore diameter.
Constructed from forged aluminum for increased strength and durability.
Designed as race pistons to handle higher performance demands.
Set includes pistons for a complete engine build.
Custom order, made to order item; no cancellations accepted.

This piston set is designed for Cummins 5.9L 12V/24V engines with a 366 cubic inch displacement.

⚠️ 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

These Mahle MS Piston sets start with a 4.055 inch bore diameter, specifically for Cummins 5.9L 12V and 24V diesel engines displacing 366 cubic inches. They are forged aluminum race pistons, meaning they are built from a solid block of aluminum that's heated and hammered into shape. This process creates a much stronger and more durable piston than cast aluminum, which is crucial for the high pressures and temperatures found in performance diesel applications. Because these are custom-ordered and made to order, they offer a unique opportunity to get precisely what your build needs.

The forged construction is key here. It allows these pistons to handle significantly more stress and heat than their cast counterparts. This is essential if you're pushing your Cummins engine beyond its stock capabilities, whether for towing, competition, or just a more robust daily driver. The 366 cubic inch displacement is achieved through this specific bore size and stroke combination, and these pistons are designed to fit that configuration perfectly. Remember, these are custom order items, so once placed, the order cannot be canceled, and they are not CARB approved, meaning they cannot be shipped to California.

When rebuilding or significantly upgrading your Cummins 5.9L engine, a strong set of pistons is fundamental. These Mahle MS pistons are a well-built option for those seeking enhanced performance and reliability under demanding conditions. It's always a good idea to consult with a professional or refer to Mahle's specific installation guidelines to ensure proper fitment and assembly, especially given the custom nature of this order.