Cylinder Head Gasket

Features:

• Fits 2017-2023 Duramax L5P engines
• Grade C 
• 2 needed per engine
• OE-grade sealing performance
• Multi-layer steel gasket construction
• Helps maintain cylinder pressure
• Supports proper coolant sealing
• Built for diesel combustion pressure
• Ideal for head gasket replacement
• Suitable for stock or mild builds
• Engineered for precise fitment

Built To Keep Your Duramax Running Strong

When you are putting your L5P back together, the last thing you want is a weak seal causing problems down the road. The MAHLE 55524 Cylinder Head Gasket is built to give your 2017-2023 Silverado or Sierra HD the dependable sealing performance your Duramax demands. From daily towing to long highway pulls, this gasket is designed to handle the intense cylinder pressures created by the 6.6L diesel platform. The multi-layer steel construction adds the strength needed for long-term durability while helping maintain proper combustion sealing under load. Additionally, MAHLE engineered this gasket to OE specifications, so fitment and installation feel right from the start instead of becoming a frustrating guessing game. That level of precision matters when you are dealing with critical engine repairs where every sealing surface counts. Whether you are freshening up a hard-working truck or replacing a failed gasket before bigger issues appear, this head gasket delivers the confidence and reliability serious Duramax owners expect.

Precision Engineered Sealing For The L5P Platform

The MAHLE 55524 Cylinder Head Gasket was specifically developed for the 6.6L Duramax L5P engine found in 2017-2023 GM 2500HD and 3500HD trucks. Its MLS design uses multiple layers of steel to create consistent sealing strength across the cylinder head and engine block surfaces. This construction helps maintain cylinder pressure while also protecting coolant passages from leaks that can lead to overheating or engine damage. What's more, the gasket is engineered to OE standards to ensure proper thickness, alignment, and sealing characteristics during installation. That precision fit helps support stable combustion performance in both stock and mildly tuned applications. MAHLE is widely recognized for manufacturing high-quality engine sealing components, making this gasket a trusted choice for professional repairs and rebuilds. For Duramax owners looking for dependable sealing performance without compromising factory reliability, this gasket delivers the durability needed for demanding diesel use.

Fitment: 2017, 2018, 2019, 2020, 2021, 2022, 2023 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax L5P

Notes:

• Designed specifically for 6.6L Duramax L5P engines
• Fits 2017-2023 Silverado and Sierra HD models
• Confirm engine code before ordering
• Intended for stock or mildly tuned applications
• Best used during cylinder head service
• Check head and block surface condition
• Proper torque procedure is required
• MLS gaskets require clean sealing surfaces
• Replace damaged or stretched head bolts
• Verify all coolant passages are sealed