Product Description
Seal your 6.6L the right way with the MAHLE 54585 Left (Driver-Side) Head Gasket — Grade C, 1.05mm. This OE-grade multi-layer steel (MLS) gasket is engineered for the 2001–2016 GM 6.6L Duramax (LB7, LLY, LBZ, LMM, LML) to restore reliable combustion sealing under towing, work, or performance use. Built to MAHLE standards for clamp-load retention and surface-finish compatibility on modern diesel aluminum heads and iron blocks.
Fitment
- 2001–2004 LB7 6.6L Duramax — Silverado/Sierra 2500HD & 3500HD
- 2004.5–2005 LLY 6.6L Duramax — Silverado/Sierra 2500HD & 3500HD
- 2006–2007 LBZ 6.6L Duramax — Silverado/Sierra 2500HD & 3500HD
- 2007.5–2010 LMM 6.6L Duramax — Silverado/Sierra 2500HD & 3500HD
- 2011–2016 LML 6.6L Duramax — Silverado/Sierra 2500HD & 3500HD
- Certain Express/Savana 6.6L applications (verify by VIN/RPO and bank)
Cross-Reference / Alternatives (Mahle only)
- Right-side match, Grade C 1.05mm: MAHLE 54582 (RIGHT, 1.05mm)
- Left-side, Grade A 0.95mm: MAHLE 54583 (LEFT, 0.95mm)
- Left-side, Grade B 1.00mm: MAHLE 54584 (LEFT, 1.00mm)
- Wave-Stopper upgrade, Left, Grade C: MAHLE 54597 (LEFT, Wave-Stopper)
- Wave-Stopper, Right, Grade C: MAHLE 54598 (RIGHT, Wave-Stopper)
What’s Included
- (1) Left/driver-side head gasket — Grade C (1.05mm) MLS
- Head bolts/studs sold separately
FAQ
Is this the left or right gasket?
Left (driver-side). Pair with 54582 for the right/passenger side if you’re doing both banks.
What thickness is Grade C?
Grade C is 1.05mm. Choose thickness by piston protrusion and any machining performed.
Is it MLS?
Yes. Multi-layer steel with combustion sealing for high cylinder pressure durability.
Will it fit my LB7/LLY/LBZ/LMM/LML?
Yes — covers 2001–2016 6.6L Duramax (verify bank/grade by VIN and service info before opening packaging).
Specifications for Mahle 54585
| Attribute | Value |
|---|---|
| Brand | Mahle |
| Part Number | 54585 (Left, Grade C 1.05mm) |
| UPC | 027067719935 |
| GTIN | 027067719935 |
| Engine Compatibility | 2001–2016 GM 6.6L Duramax (LB7/LLY/LBZ/LMM/LML) |
| Material / Design | Multi-Layer Steel (MLS) |
| Bore (typical) | ≈105.4 mm |
| Package Dimensions | 6.00" × 6.00" × 6.00" (per listing) |
| Shipping | Calculated at Checkout |
| Prop 65 | See www.P65Warnings.ca.gov |
