What does the '020' in the part description mean?

The '020' indicates that these pistons are 0.020 inches larger than the standard factory size. This is common when an engine block needs to be bored out to clean up cylinder walls or compensate for wear during an overhaul.

What is the compression ratio for these pistons?

These pistons are designed for a 17.1:1 compression ratio, which is typical for high output (HO) versions of the Cummins B 5.9L engine. This ratio is higher than standard and contributes to increased power.

What else might I need when installing this piston set?

When rebuilding an engine with new pistons, you'll typically also need new piston rings, connecting rod bearings, main bearings, gaskets, seals, and potentially an oil pump and oil cooler. Always consult the manufacturer's installation guide for a complete list of recommended parts and procedures.

Mahle OE Cummins B 5.9L Piston Set 2253672020

Name: Mahle OE Cummins B 5.9L 020 03-04 17.1:1 CR HO Vin C Eng ETH Rebore Kit Assy Set (Set of 6)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-cummins-b-5-9l-020-03-04-17-1-1-cr-ho-vin-c-eng-eth-rebore-kit-t14-53025
Price: 844.62 USD
Availability: BackOrder

Mahle OE Cummins B 5.9L 020 03-04 17.1:1 CR HO Vin C Eng ETH Rebore Kit Assy Set (Set of 6)

$844.62

On Backorder

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

Mahle OE Cummins B 5.9L 020 03-04 17.1:1 CR HO Vin C Eng ETH Rebore Kit Assy Set (Set of 6)

Key Features

Fits 2003-2004 Cummins B 5.9L HO engines.
Set includes six pistons, sized 0.020 inches larger than stock.
Designed for a 17.1:1 compression ratio.
Mahle OE components meet original equipment specifications.
Rebore kit assembly set for engine rebuilding.

This piston set is designed for 2003-2004 Cummins B 5.9L HO engines. Always confirm fitment with your specific vehicle's VIN and engine code.

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Product Details

If you're rebuilding the top end of your 2003-2004 Cummins B 5.9L engine, this Mahle OE rebore kit is a solid option. This set includes six pistons, all sized 0.020 inches larger than stock, designed to work with a 17.1:1 compression ratio for high output (HO) applications. Mahle is a well-known name in engine components, and their OE line aims to meet the original equipment specifications for your truck.

This kit is specifically for the Cummins B 5.9L engine, often found in Dodge Ram trucks from those years. The pistons are made to precise tolerances, ensuring they fit right into your engine block after it's been bored to the 0.020-inch oversize. Having a matched set of six pistons means you're getting consistent performance across all cylinders, which is crucial for smooth running and reliable power delivery. This is a comprehensive assembly set, meaning it comes with the necessary components to get your pistons installed correctly, assuming your block is prepared to the specified size.

When undertaking an engine rebuild of this magnitude, it's important to ensure all components are clean and properly lubricated before installation. Refer to the manufacturer's detailed installation instructions for specific guidance on piston ring gap, installation orientation, and any required assembly lubricants. This kit is not CARB approved and cannot be shipped to California.