1980-1984 GMC C2500 4.8L 6 Cyl. 1979-1984 GMC C2500 4.1L 6 Cyl. Notes: Engine Coolant Thermostat Housing Gasket. Position: Housing To Cylinder Head. Validated for fit, form, and function. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.