Slightly off topic. A 1946 Case VAC (tractor) didn't seem to be cooling or flowing coolant well. Took it off and drained it... 4 acorns, gobs of sludge, several sticks, one nut, and one bolt (they didn't match) came out.
Decided to attach it, fill it with water, run the engine for 15 minutes, and empty and drain it again. Gotta a little more sludge out this time.
Had the radiator boiled out, and it now leaked all over. Soldered up two big leaks, put some "stop leak" in to fix the hundreds of little bitty leaks, and it works great. 60 years of stuff accumulated in the radiator.
