Sorry, I should have been more clear - pre war design - I appreciate we continued production some years after in a lot of cases!Side valve Fords such as the 100E had no water pump if I recall, they were built until '59 or '60.
These https://www.flickr.com/photos/rtbcomp/albums/72157632941105294
DAP 386, 4560RA and MPF 423
Plus the green Range Rover and the brown dog
My 1946 Riley had a pump-assisted thermosyphon, and ran at 70 to 80 degC.