Product Description
MAHLE 41909.04 is a +.040 over complete piston ring set for the 2001–2004 GM 6.6L Duramax LB7 (VIN “1”). Pre-lapped, OE-grade rings deliver quick seat-in, strong compression, and long service life on fresh .040" overbores.
Why it wins: ductile-iron plasma-moly top rings for durable sealing, correct standard tension for street/tow builds, and a proven 3-piece oil ring for consistent oil control.
Fitment
- 2001–2004 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L Duramax LB7 (VIN “1”)
- Oversize / Bore: +.040" (≈4.095")
- Ring widths (Top / Second / Oil): 3.0 mm / 2.0 mm / 3.0 mm
- Configuration: Complete engine set (rings for all 8 cylinders)
Cross-Reference / Alternatives (MAHLE on CPP Diesel)
- Standard (STD): MAHLE 41909 (STD)
- Standard (consumer pack): MAHLE S41909 (STD)
- +.010 Over: MAHLE 41909.01
- +.020 Over: MAHLE 41909.02
- +.030 Over: MAHLE 41909.03
Specifications for Mahle 41909.04
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | 41909.04 (aka 41909.040) |
| UPC | 027067460820 |
| GTIN | 027067460820 |
| Engine Compatibility | 2001–2004 GM 6.6L Duramax LB7 |
| Ring Widths (Top/Second/Oil) | 3.0 mm / 2.0 mm / 3.0 mm |
| Bore / Oversize | ≈4.095" / +.040" |
| Configuration | Complete engine set (8 cylinders) |
| Shipping | Free standard ground shipping |
| 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 this a full engine set or a single-cylinder set?
It’s a complete set for all eight cylinders (top, second, and oil ring assemblies).
Do I need machine work for .040 over?
Yes. Order this set only after your block has been bored and honed to +.040" (verify final bore and set ring end-gaps).
What ring materials are used?
Ductile-iron plasma-moly top ring, cast-iron second ring (chrome-faced), and a stainless 3-piece oil ring assembly.
Will this fit other Duramax generations?
The 41909 family is commonly listed for 2001–2010 applications. If you’re not LB7 (’01–’04), confirm part selection by year/engine code before ordering.
