Now the bad news. There was a little water in the bottom cylinder when I pulled the head. There is no evidence, that jumped out to me anyway, that water had been in there before. The cylinder walls were smooth, no scoring. No obvious old rust.
But, the clean combustion chamber says water was there when it was running? Right?
Shot of the cylinders.
I put water hose pressure from the bottom up and from the thermostat down trying to blow out the clog. I don’t know if that matters.