Product Description
MAHLE 41909.03 is the +.030" over piston ring set engineered for the 2001–2004 GM 6.6L Duramax LB7 (VIN “1”). This complete 8-cylinder kit uses OE-grade materials and a plasma-moly top ring to deliver fast seat-in, stable sealing, and reliable oil control on fresh .030" overbores.
Why it wins: consistent face coating for rapid break-in, correct standard tension for street/tow durability, and proven 3-piece oil control for long service life.
Fitment
- 2001–2004 Chevrolet Silverado 2500HD/3500HD — 6.6L Duramax LB7 (VIN “1”)
- 2001–2004 GMC Sierra 2500HD/3500HD — 6.6L Duramax LB7 (VIN “1”)
- Oversize: +.030" (approx. 4.085" finished bore); complete set for V8
Cross-Reference / Alternatives (MAHLE on CPP Diesel)
- Standard Bore (STD): MAHLE 41909 (STD)
- Economy STD: MAHLE S41909 (STD)
- +.010" Over: MAHLE 41909.01
- +.020" Over: MAHLE 41909.02
- +.040" Over: MAHLE 41909.04
Specifications for Mahle 41909.03
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | 41909.03 |
| UPC | 027067460813 |
| GTIN | 027067460813 |
| Engine Compatibility | 2001–2004 GM 6.6L Duramax LB7 (VIN “1”) |
| Ring Widths (Top / Second / Oil) | 3.0 mm / 2.0 mm / 3.0 mm |
| Bore / Oversize | ≈4.085" / +.030" |
| Includes | Complete ring set for 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 or reproductive harm. Learn more. |
FAQ
Is this a full engine set?
Yes—one kit covers all 8 cylinders.
What engines does 41909.03 fit?
2001–2004 Duramax LB7 (VIN “1”) on .030" overbore service. Always verify VIN and bore size before ordering.
Are the rings pre-lapped and what are the widths?
Pre-lapped for quick seat-in. Nominal widths: 3.0 mm / 2.0 mm / 3.0 mm (top/second/oil).
Do I still need to set ring gap?
Yes. Always measure and set end gaps to your machinist’s and MAHLE’s specs for the intended use.
