MAHLE 41909.02 PISTON RING SET (.020) FOR 01-10 GM DURAMAX 6.6L

Product Description

Dial in cylinder sealing on your LB7/LLY/LBZ/LMM with the MAHLE 41909.02 Piston Ring Set (.020) for the 2001–2010 GM 6.6L Duramax. This complete engine set features a ductile-iron plasma-moly top ring, cast-iron second ring, and GNS oil ring assembly—pre-lapped for quick seat-in and long service life. Engineered to MAHLE OEM standards to restore compression, reduce blow-by, and keep your build reliable on the street, tow rig, or work truck.

Mahle 41909.02 piston ring set, Duramax 6.6L .020 over rings, LB7 LLY LBZ LMM ring set, 2001-2010 GM 6.6 piston rings, plasma moly top ring, pre-lapped rings, file-fit ring set, CPP Diesel Mahle rings

Fitment

• 2001–2010 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD — 6.6L Duramax (LB7, LLY, LBZ, LMM)
• 2003–2009 Chevrolet Kodiak/GMC TopKick 4500–5500 — 6.6L Duramax
• 2006–2010 Chevrolet Express/GMC Savana 2500/3500 — 6.6L Duramax
• Also fits other listed 6.6L applications for these RPOs. Verify oversize and end-gap for your build.

Cross-Reference / Alternatives (Mahle only)

• Mahle 41909 (Standard): 41909 STD
• Mahle 41909.01 (.010): 41909.01
• Mahle 41909.03 (.030): 41909.03
• Mahle 41909.04 (.040): 41909.04

What’s Included

• Complete engine set of piston rings for all eight cylinders (.020" over)
• Top ring: ductile iron, plasma-moly face  •  Second ring: cast iron  •  Oil ring assembly: GNS

FAQ

Is this a full engine set?
Yes—one package services all eight cylinders on a single 6.6L engine.

Will these rings fit LB7, LLY, LBZ, and LMM?
Yes—this .020" set covers 2001–2010 Duramax LB7/LLY/LBZ/LMM applications listed above (confirm your overbore).

Are the rings pre-lapped and what about break-in?
They’re pre-lapped to seat quickly; still verify and set end-gaps for your intended use.

What bore size does .020" over correspond to?
Approx. 4.075" nominal (4.0748"). Always measure your actual bore and file-fit as needed.

Specifications for Mahle 41909.02