Product Description
MAHLE S41909 standard-size piston ring set for the 2001–2010 GM 6.6L Duramax (LB7/LLY/LBZ/LMM). OE-quality construction with plasma-moly top ring for durability and proper sealing. Single-cylinder set — order quantity 8 for a complete V8.
- Engine: 6.6L Duramax (LB7, LLY, LBZ, LMM)
- Bore (std): 4.0551" (approx. 103.0 mm)
- Top ring: Ductile iron, plasma-moly face
- Second ring: Cast iron
- Oil ring assembly: Gas nitride steel (GNS), 3-piece
- Pre-lapped for quick seating
- GTIN/UPC: 027067555106
Fitment
- 2001–2010 Chevrolet Silverado 2500HD/3500HD (6.6L Duramax)
- 2001–2010 GMC Sierra 2500HD/3500HD (6.6L Duramax)
- 2001–2010 Chevrolet Express 2500/3500/4500 (6.6L Duramax)
- 2001–2010 GMC Savana 2500/3500/4500 (6.6L Duramax)
- Also covers medium-duty Kodiak/TopKick C4500–C5500 where equipped
Cross Reference
- MAHLE: S41909 (also listed as 41909)
- Clevite/MAHLE: S41909
- UPC/GTIN: 027067555106
What’s Included
One (1) cylinder’s rings: top, second, and oil ring assembly. Order 8 sets for a complete engine.
FAQ
Is this a complete engine set?
No. This is a single-cylinder ring set. You need 8 sets for a full V8 rebuild.
Will it fit my LB7/LLY/LBZ/LMM?
Yes, this standard-size set fits 2001–2010 6.6L Duramax engines (LB7 through LMM). Verify cylinder bore and service size before ordering.
What materials/coatings are used?
Plasma-moly ductile-iron top ring, cast-iron second, gas-nitrided 3-piece oil ring for durability and sealing.
Do I need machine work?
Measure bores and check finish; follow GM/Mahle specs. If out of spec, hone and choose proper oversize rings.
