Product Description
MAHLE 55524 is the Grade C multi-layer steel (MLS) cylinder head gasket engineered for the 2017–2023 GM 6.6L Duramax L5P. Designed to deliver OE sealing under high cylinder pressure, this gasket restores quench and compression on stock or lightly modified L5P builds. Sold individually—order two per engine (one per bank).
Fitment
- 2017–2023 Chevrolet Silverado 2500HD / 3500HD — 6.6L Duramax L5P
- 2017–2023 GMC Sierra 2500HD / 3500HD — 6.6L Duramax L5P
- Notes: Grade C targets ~1.30 mm (.051") service thickness. Two gaskets required per engine (left & right banks). Always verify piston protrusion and grade selection.
Cross-Reference / Related MAHLE Items (Internal links only)
- MAHLE 55522 — Grade A L5P Head Gasket
- MAHLE 55523 — Grade B L5P Head Gasket
- MAHLE VS50966 — L5P Valve Cover Gasket Set
Why MAHLE
- Proven MLS construction with combustion load limiters for clamp-load retention
- OE-fit geometry for consistent sealing after heat cycles
- Trusted quality for daily drivers, tow rigs, and fleet service
Installation Notes
- Measure piston protrusion and select Grade A/B/C accordingly
- Use new torque-to-yield head bolts or quality studs; follow GM/MAHLE torque and surface-finish specs
- Clean, dry surfaces; verify RA/RZ for MLS gaskets
FAQ
How many gaskets do I need for an L5P?
Two—one per cylinder head/bank on the V-8 L5P.
What thickness is Grade C?
Grade C targets approximately 1.30 mm (~.051"). Always confirm grade by piston protrusion.
Does this fit all 2017–2023 L5P trucks?
Yes—Silverado/Sierra 2500HD/3500HD with 6.6L Duramax L5P. Verify VIN/build details before ordering.
Is hardware included?
No. Head bolts/studs sold separately. We recommend replacing TTY bolts or upgrading to studs during reassembly.
Specifications for Mahle 55524
| Attribute | Value |
|---|---|
| Brand | MAHLE Original |
| Part Number | 55524 (Grade C) |
| UPC / GTIN-12 | 639789320223 |
| Material / Design | Multi-Layer Steel (MLS), Grade C thickness ~1.30 mm |
| Qty Required Per Engine | 2 (one per bank) |
| Package Dimensions | Approx. 24.00" L × 9.00" W × 1.00" H |
| Shipping | Calculated at checkout; optional shipping insurance available |
| Country of Origin | Not specified |
| Prop 65 | This product can expose you to chemicals including lead and lead compounds, known to the State of California to cause cancer and birth defects or other reproductive harm. More info: www.P65Warnings.ca.gov. |
