17-23 GM 6.6L L5P Duramax Mahle Cylinder Head Gasket Grade B

Fits: 2017-2023 GM 6.6L L5P Duramax

Multi-layer steel (MLS) Grade B head gasket for 2017-2023 GM 6.6L Duramax L5P VIN Y engines with torque-to-yield fasteners. Grade B has a thickness of about ~1.19–1.31 mm and is suited for engines with minor resurfacing or service thickness requirements. Sold individually — use two per engine (one per bank). Grade B head gaskets are a middle thickness spec for MLS head gaskets. On Duramax L5P engines, Grade B (approx. 1.19-1.31mm) is commonly used when the block and head have been resurfaced slightly or to match service thickness targets after machining. It’s essential to measure piston protrusion and deck height after any machine work to determine whether Grade A, B, or C is correct for your rebuild.

Mahle: 55523