Product Description
Refresh sealing and compression on your 6.6L with the MAHLE 41909.01 Piston Ring Set (.010 Over) for 2001–2010 GM Duramax (LB7/LLY/LBZ/LMM). OE-grade materials, pre-lapped faces, and factory-correct tension deliver fast seat-in, strong ring seal, and long service life after a .010" overbore.
Fitment
- 2001–2010 Chevrolet/GMC 2500HD & 3500HD — 6.6L Duramax LB7, LLY, LBZ, LMM
- Verify .010" overbore (approx. 4.065" bore) before ordering.
Cross-Reference / Alternatives (Mahle only)
- Mahle 41909 Piston Ring Set (STD): 41909 (STD)
- Mahle S41909 Piston Ring Set (STD economy): S41909 (STD)
- Mahle 41909.02 Piston Ring Set (.020): 41909.02 (.020)
- Mahle 41909.03 Piston Ring Set (.030): 41909.03 (.030)
What’s Included
- Complete engine set: top, second, and oil ring assemblies for all 8 cylinders
- Top ring: ductile iron, plasma-moly face; second: cast iron; oil ring assembly: GNS
Why Buy From CPP Diesel
- Fast shipping and diesel-focused tech support
- Curated Mahle coverage for Duramax platforms
FAQ
Is this a full engine set?
Yes—one kit covers all 8 cylinders.
Do I need machine work?
Yes. This kit is for engines bored .010" over. Confirm bore size and finish; hone to spec for proper seating.
Are the rings pre-lapped?
Yes—pre-lapped to speed seat-in under normal operation.
Which Duramax codes does it fit?
LB7, LLY, LBZ, and LMM (2001–2010) 6.6L applications.
Specifications for Mahle 41909.01
| Attribute | Value |
|---|---|
| Brand | Mahle |
| Part Number | 41909.01 |
| UPC | 027067460790 |
| GTIN | 027067460790 |
| Engine Compatibility | 2001–2010 6.6L Duramax (LB7/LLY/LBZ/LMM) |
| Bore / Oversize | ~4.065" (+.010") |
| Package Dimensions (W×H×D) | 5.00" × 6.00" × 10.00" |
| Shipping | Free Shipping |
| Country of Origin | Brazil (per Mahle listing) |
| Prop 65 | Not specified by manufacturer. See www.P65Warnings.ca.gov. |
