Product Description
MAHLE 55522 Grade A multi-layer steel (MLS) cylinder head gasket delivers OE-level sealing for 2017–2023 6.6L Duramax L5P (VIN Y). Built with a combustion-load limiter for clamp stability under boost, this gasket maintains proper quench and compression when Grade A thickness is required—ideal for stock and work/tow builds.
Fitment
- 2017–2023 Chevrolet Silverado 2500HD/3500HD – 6.6L Duramax L5P (VIN Y)
- 2017–2023 GMC Sierra 2500HD/3500HD – 6.6L Duramax L5P (VIN Y)
- Note: Order two gaskets per engine (one per bank). Grade selection must be based on measured piston protrusion at TDC.
Cross-Reference / Alternatives (MAHLE only)
- MAHLE 55523 – Grade B L5P Head Gasket
- MAHLE 55524 – Grade C L5P Head Gasket
- MAHLE VS50966 – L5P Valve Cover Gasket Set
Why MAHLE
- MLS construction with load-limiting layer for consistent clamp force
- Direct-fit geometry for L5P decks and fire-ring locations
- Trusted OE supplier materials and surface-finish compatibility
Installation Notes
- Confirm piston protrusion and select correct A/B/C grade before assembly
- Use new torque-to-yield bolts or upgrade to head studs; follow torque/angle spec
- Verify RA surface finish suitable for MLS gaskets; clean and dry sealing faces
FAQ
How do I know Grade A is correct?
Measure piston protrusion at TDC and match to the service thickness target for Grade A. This maintains proper quench and compression.
How many gaskets do I need for an L5P?
Two—one per cylinder head (left and right banks).
Is the 55522 gasket MLS?
Yes. MAHLE 55522 is a multi-layer steel (MLS) head gasket with a combustion load limiter.
Do I need a top-end set too?
We recommend pairing two head gaskets with an L5P upper set (valve cover/intake/exhaust and related seals) for a complete job.
Specifications for Mahle 55522
| Attribute | Value |
|---|---|
| Brand | MAHLE Original |
| Part Number | 55522 (Grade A) |
| GTIN (14) | 00639789320209 |
| UPC (12) | 639789320209 |
| Material / Type | Multi-Layer Steel (MLS) with combustion load limiter |
| Quantity Required | 2 per engine (V-8) |
| Shipping Info | Ships from CPP Diesel; shipping calculated at checkout. Typical pkg dims: 24.00" L × 9.00" W × 1.00" H. |
| Country of Origin | Not specified by manufacturer |
| Prop 65 | WARNING: This product can expose you to chemicals including lead and lead compounds. For more information, visit www.P65Warnings.ca.gov. |
