Parts Geek - For 1965-1966 GMC 3500 Water Distribution Pipe 42491XFYB. 1965 GMC 3500 5.0L V6. 1966 GMC 3500 5.7L V6. 1966 GMC 3500 5.0L V6. 1966 GMC 3500 4.8L 6 Cyl. 1966 GMC 3500 4.1L 6 Cyl. Notes: Engine Coolant Water Outlet -- Includes Housing and Gasket.
