Product Description
MAHLE 55524 is the Grade C multi-layer steel (MLS) cylinder head gasket for the 2017–2023 GM 6.6L Duramax L5P. It’s an OE-quality, direct-fit gasket engineered for reliable sealing on stock or lightly modified engines. Sold individually; two required per engine (one per bank).
- Material: Multi-Layer Steel (MLS)
- Grade: C (service thickness approx. 1.30 mm / .051")
- Quantity: 1 gasket (order 2 per engine)
- Direct-fit for L5P 6.6L Duramax
Fitment
- 2017–2023 Chevrolet Silverado 2500HD / 3500HD (6.6L Duramax L5P)
- 2017–2023 GMC Sierra 2500HD / 3500HD (6.6L Duramax L5P)
Cross Reference & Alternatives
- GM OE Grade C: 12727486 (also supersessions 12636480, 12676859)
- Related MAHLE head gaskets by grade: Grade A 55522, Grade B 55523
- Complementary set (no head gaskets): MAHLE HS55522 head set
What’s Included
One (1) Grade C MLS cylinder head gasket. Order two gaskets to service both banks. Head bolts/studs sold separately.
FAQ
Is this the correct thickness for Grade C?
Yes. MAHLE specifies Grade C around 1.30 mm (.051") MLS construction for L5P applications.
How many gaskets do I need?
Two per engine—one for each cylinder head.
Will this fit my 2017–2023 L5P?
Yes—this gasket fits 2017–2023 Chevy/GMC 2500HD/3500HD with the 6.6L Duramax L5P.
Do I need new head bolts or studs?
L5P uses torque-to-yield fasteners—replace bolts or upgrade to studs during reassembly for best results.
