Product Description
MAHLE 41909.01 complete piston ring set (.010" oversize) for the GM 6.6L Duramax (LB7/LLY/LBZ/LMM). OE-quality rings engineered for reliable sealing, restored compression, and long service life. Rings are pre-lapped for quick seat-in and built to factory specs.
- Top ring: Ductile iron, plasma-moly face
- Second ring: Cast iron
- Oil ring assembly: GNS
- Bore (in): 4.065
- Oversize: 0.010"
- Country of origin: Brazil
Fitment
- 2001–2010 GM/Chevy/GMC 6.6L Duramax LB7, LLY, LBZ, LMM (Ram 2500/3500 equivalent not applicable)
Cross Reference / IDs
- MAHLE MPN: 41909.01 (a.k.a. 41909010)
- GTIN/UPC: 027067460790
FAQ
Is this a complete set?
Yes, it’s a full piston ring set for a single engine (all cylinders).
Do I need machine work?
Verify cylinder finish and size for .010" over; proper hone and RA are required for best ring seating.
Are the rings pre-lapped?
Yes—pre-lapped for quicker seat-in and minimal break-in.
Will these fit all 2001–2010 Duramax codes?
Yes—LB7, LLY, LBZ, and LMM 6.6L applications.
