6.6L Duramax Head Gasket Identification

January 31, 2012

The 6.6 L Duramax engine families utilize three different grades (thicknesses) of head gaskets that are also specific to which side of the engine they are being installed on. The table and images below will aid in identifying the proper head gaskets required for your specific application. Some head gaskets may not have the grade designation shown in Figure 2. In these instances, use the grade designation shown in Figure 1. The head gaskets listed below work in conjunction with the AP0045 and AP0046 Head Installation Kits.

AP Part NumberLocation
(Figure 3 & 4)
(Figure 1 & 2)
Compressed ThicknessOEM Part Number
(Driver Side)
A0.90-1.00 mm98045058
(Driver Side)
B0.95-1.05 mm98045059
(Driver Side)
C1.00-1.10 mm98045060
(Passenger Side)
A0.90-1.00 mm98045055
(Passenger Side)
B0.95-1.05 mm98045056
(Passenger Side)
C1.00-1.10 mm98045057

Note: These gaskets should be replaced “like for like.” It is not recommended to install gaskets of a different thickness than what was originally equipped.

Jimmy Finch

Dallas Branch Manager, M&D Distributors

Jimmy Finch has over 33 years of experience in Diesel Engine Sales, Service and Repair. His experience started early in life at Texas Fuel Injection Service (an early acquisition of M&D) as a job with a means to an end. Somewhere in that 33 years this job turned into a fulfilling career. He started in the injector clean up department and has held practically every position leading up to his current role as Branch Manager of the Dallas, Texas location.

In his spare time, Jimmy enjoys spending time with his wife of 24 years, Priscilla. They are currently getting ready to make their way into the empty-nesters stage of life. He also enjoys the occasional hunting trip with friends and family and chasing down potential customers by the names off their trucks.

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