My 59A block - completely rebuilt higher horse output, new Brassworks copper radiator, 6 blade mechanical early ford truck fan, skips pumps and Robert Shewman 180 thermostats. Temp in New England was 45 today - warmed up the flatty to 160 before we set off for a run - temp went down at speed to 120! Thermostats never opened as the car could not get warm! Each head has its own new SW temp gauge plus the stock unit - all three said 120! We pulled the thermostats and tested them - opened at 180.
Perhaps too much water is running thru the pass thru holes in the high flow thermostats? We'll try soldering closed one of the three pass thru holes in each thermostat and see what happens.
So strange to have a hot (as in performance) flatty running to cool