1966 GMC 2500 Engine: 4.1L L6; 1-13/16 In. Part Type: Engine Coolant Outlet Gasket. Eng Coolant Gasket. Compatible Years: 1966. PermaDryPlus Gasket Included;. Ensure that this part fits your vehicle by entering your vehicle's Year, Make, Model, Trim, and Engine in the Compatibility Table.
