What does '.020 undersize' mean for these pistons?

This means the pistons are manufactured to be 0.020 inches smaller in diameter than the original factory bore size. They are intended for use in an engine block that has already been machined (bored) to this specific undersize to achieve the correct piston-to-wall clearance.

Does this set include everything needed to install the pistons?

Yes, this set includes four pistons, the corresponding piston rings, wrist pins, and retaining clips, all pre-mounted for your convenience. You will need standard engine rebuilding tools and potentially other gasket sets for a complete engine overhaul.

Are these pistons suitable for all 6.6L Duramax engines?

This specific set is designed for the 2006-2010 6.6L Duramax LMM and LBZ engines with a VIN code of 26D, and it is for the left bank only. Always verify your engine's specific model, year, VIN code, and bank requirements before purchasing.

Mahle OE GM 6.6L Duramax Piston Set .020 Undersize 2243709WR

Name: Mahle OE GM 6.6L Duramax 06-09 LMM LBZ Vin 26D .020 Left Bank Only Piston With Rings Set (Set of 4)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-gm-6-6l-duramax-06-09-lmm-lbz-vin-26d-020-left-bank-only-pisto-t14-52905
Price: 737.93 USD
Availability: BackOrder

Mahle OE GM 6.6L Duramax 06-09 LMM LBZ Vin 26D .020 Left Bank Only Piston With Rings Set (Set of 4)

$737.93

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 GM 6.6L Duramax 06-09 LMM LBZ Vin 26D .020 Left Bank Only Piston With Rings Set (Set of 4)

Key Features

Fits 2006-2010 Chevrolet and GMC trucks with the 6.6L Duramax LMM/LBZ engine (VIN code 26D).
This is a set of 4 pistons for the left bank only.
The pistons are .020 inch undersize, intended for bored engine blocks.
Features compensated ring grooves for proper ring loading and oil control.
Expansion-controlled design reduces engine noise, wear, and emissions.
Pistons come with pre-mounted rings, pins, and clips for easier installation.

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Will this fit your vehicle?

Product Details

If you're rebuilding the top end of your 2006-2010 GM Duramax truck, specifically the LMM or LBZ engines with a VIN code of 26D, this Mahle OE piston set is a solid choice. This set is designed for the left bank of the engine and comes in a .020 inch undersize, meaning it's intended for engine blocks that have already been bored out to that specification. Mahle is a major OE supplier, so you're getting parts that meet the original factory standards for fit and function.

These pistons are built with compensated ring grooves to ensure the piston rings seat properly and control oil effectively. They also feature expansion-controlled designs, which allow for tight clearances when the engine is cold. This reduces engine noise, wear, and emissions, while also improving oil control throughout the engine's operating temperature range. Mahle makes it convenient for engine builders by including the piston rings, pins, and clips already mounted on the pistons, so they're ready to go right out of the box. This attention to detail helps streamline the rebuilding process.

This set includes four pistons, all the necessary rings, wrist pins, and retaining clips. It's important to note that these are specifically for the left bank of the engine and are .020 inch undersize. Always confirm your engine's bore size and bank requirements before ordering to ensure you get the correct parts for your rebuild.