The AAM Group 28-12637788 GM OEM Cylinder Head Gasket 1.05mm Grade C 6.6L Duramax Diesel

The AAM Group part number 28-12637788 is a GM OEM Cylinder Head Gasket (Grade C, 1.05 mm) engineered specifically for General Motors 6.6L V8 Duramax diesel engines. This is a genuine GM-sourced replacement gasket, identical to the original factory component installed during production, ensuring a precise fit and reliable seal.

The 1.05 mm thickness designation indicates this is the Grade C specification, used during engine rebuild or head gasket replacement procedures on Duramax-equipped trucks and vans. This gasket seals the cylinder head to the engine block, maintaining compression and preventing coolant or oil from entering the combustion chamber.

Key Features:

• GM OEM Part: Genuine factory-specification head gasket (GM OEM# 12637788)
• Grade C / 1.05 mm thickness — correct specification for Duramax diesel head gasket service
• Position: Right (Passenger Side)
• Engine Application: 6.6L V8 Diesel (Duramax LB7, LLY, LBZ, LMM, LGH, LML)
• Designed, engineered, and tested to GM's rigorous quality standards
• Direct OEM replacement — no modifications required for installation

OEM Cross-Reference Numbers: 19301793, 97188466, 97288225, 97309561, 97333724, 97378101, 97389255, 98030630, 98045057, 98062782

Note: New head bolts are required whenever the cylinder head is removed for gasket replacement on Duramax diesel engines. Always verify grade/thickness specification before ordering.