What does the .020 undersize mean for these pistons?

The .020 undersize indicates that these pistons are designed to fit into a cylinder bore that has been machined .020 inches larger than its original factory size. This is common during engine rebuilds to clean up worn or damaged cylinder walls.

Do these pistons come with everything needed for installation?

Yes, this set includes four pistons with the piston rings already mounted. It also comes with the necessary wrist pins and clips, making them ready for installation into your engine.

Are these pistons suitable for all 6.6L Duramax engines?

This specific piston set is designed for the 6.6L Duramax L engine with the PCR (Piston Cooling Ring) feature, commonly found in the specified 2001-2005 Chevrolet and GMC trucks. Always verify your engine's specific configuration before purchasing.

2001-2005 Chevy Silverado 2500 HD Piston Set

Name: Mahle OE GM 6.6L Duramax L w/ PCR - .020 DSL Piston With Rings Set (Set of 4)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-gm-6-6l-duramax-l-w-pcr-020-dsl-piston-with-rings-set-set-of-4-t14-53340
Price: 562.61 USD
Availability: BackOrder

Mahle OE GM 6.6L Duramax L w/ PCR - .020 DSL Piston With Rings Set (Set of 4)

$562.61

On Backorder

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

Fits 2001-2005 Chevrolet Silverado 2500 HD. Mahle OE diesel piston set with rings, .020 undersize. Ready for installation.

Key Features

Fits 2001-2005 Chevrolet Silverado 2500 HD, 2001-2005 Chevrolet Silverado 3500, 2001-2005 GMC Sierra 2500 HD, and 2001-2005 GMC Sierra 3500.
Mahle OE quality pistons built to original equipment specifications for the 6.6L Duramax L w/ PCR engine.
This is a set of four pistons, each measuring .020 inches undersize.
Features compensated ring grooves for proper ring loading and oil control.
Expansion-controlled design reduces engine noise, wear, and emissions while improving oil control.
Pistons come with rings pre-mounted, and include pins and clips for easier installation.

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Will this fit your vehicle?

Product Details

If you're rebuilding the engine in your 2001-2005 Chevrolet Silverado 2500 HD or 3500, or the equivalent GMC Sierra, this Mahle OE .020 undersize diesel piston and ring set is a solid choice. Mahle is a major OE supplier, meaning these pistons are built to the same specifications as the ones originally installed in your 6.6L Duramax L with PCR engine. They are designed for a direct fit and come ready for installation, saving you time and effort during your rebuild.

These pistons feature compensated ring grooves, which help ensure the piston rings are loaded correctly. This is important for proper oil control and helps reduce blow-by. They also incorporate expansion-controlled designs, allowing for tight fitting clearances. This not only helps reduce engine noise and wear but also contributes to lower emissions and improved oil consumption. Having the piston rings pre-mounted and including the necessary pins and clips means you can get straight to work without sourcing additional small parts.

This set includes four pistons, each measuring .020 inches undersize from the standard bore diameter. This sizing is crucial for engines that have been bored out during a rebuild to clean up any imperfections or wear in the cylinder walls. Always confirm your cylinder bore measurement before ordering to ensure you select the correct piston size for your specific engine build.