I had a 48 running hot all the time, rebuilt and advanced the ign 2 degrees, still hot,
then i ran 50/50 white vinegar and water for one day around the backroads, in the afternoon bottom tap was clugged all of a sudden, so i had to pull the bottom hoses of.
they were full of grit and crap from the entire cooling system, about 4 full hands of this stuff piled up in the pan, even what looked like casting sand. Flushed two times.
it stopped overflowing, it ran too cool all of sudden, and had a much more even heat distribution and dispatch.
The cheapest fix ever, about 5 Dollars. I`ve done the same on many cars with fascinating resaults every time. Try it
