Real technicians do not use Indian Head for anything any more. That lost popularity in the 60's. That stuff hardens like a rock and causes more problems to get it off than it helps in the first place. If the thermostat actually uses a gasket and not an O-ring like many do now, the ideal method is to use a spray tack on the removable housing and attach the gasket to it. Then use a light coat of silicone on the engine side of the gasket. That way it seals good and when removed, the surface can be cleaned up easily.
Tuesday, January 19th, 2016 AT 2:16 AM