Product Description
MAHLE 41909.01 is a complete .010" oversize piston ring set for the 2001–2004 GM 6.6L Duramax LB7. Built to OE standards with pre-lapped faces and factory-correct tension, this kit restores compression and oil control after a .010" overbore so your LB7 seals up fast and runs clean.
Fitment
- 2001–2004 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L Duramax LB7 (VIN “1”)
- Oversize: +.010" (approx. 4.065" bore). Always verify final hone size and set ring end-gaps to spec.
- Contents: Complete engine set (all 8 cylinders).
Cross-Reference / Alternatives (MAHLE on CPP Diesel)
- Standard (STD): MAHLE 41909 (STD)
- Economy STD: MAHLE S41909 (STD)
- +.020": MAHLE 41909.02 (.020)
- +.030": MAHLE 41909.03 (.030)
- +.040": MAHLE 41909.04 (.040)
Specifications for Mahle 41909.01
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | 41909.01 |
| UPC | 027067460790 |
| GTIN | 00027067460790 |
| Engine Compatibility | 2001–2004 GM 6.6L Duramax LB7 |
| Bore / Oversize | ≈4.065" / +.010" |
| Configuration | Complete engine set (8 cylinders) |
| Shipping | Standard ground; rates shown at checkout |
| Prop 65 | This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Learn more. |
FAQ
Is 41909.01 a full engine set?
Yes—this kit services all eight cylinders on the LB7.
What bore size does +.010" correspond to?
Approximately 4.065" (103.25 mm). Always verify final hone size and set end-gaps to your build.
Will this fit my LB7 if I haven’t overbored?
No—use STD size if your cylinders are standard. Choose +.010" only after an overbore/hone to +.010".
Are the rings pre-lapped?
Yes—MAHLE pre-laps the ring faces to speed initial seating when bores are finished correctly.
