Thanks again everyone, especially Andy and Tom. I will definitely check out my hoses and water wetter. Morgan Spares fitted a new aluminum radiator and an overflow system to my car four or five years ago and I just flushed it out and replaced the antifreeze, but will try doing a more thorough job next year. The head gasket seems to be fine. I’m planning to add a cowl scoop and an electric fan behind the radiator, perhaps a Spal.
