Overheating-1941 120

Posted by jrbrks2 On 2025/3/14 5:48:08

My 1941 120 is continuing to overheat somewhat quickly, in spite of having completed the following:
1) flushed the system, including removing the plug from the rear of the block.
2) the radiator was removed and completely rebuilt at a competent radiator shop. The shop did tell me the radiator was flowing poorly and had numerous leaks following their “shop cleaning”. Thus, I am confident the radiator needed this repair.
3) replaced thermostat with a 160 degree NAPA thermostat. I did confirm the new thermostat was opening at the correct temperature, before I installed it.
4) I did not replace the water pump, but the shaft seemed tight and there is no leaking or noise from the pump.
5) the engine starts easily and runs very smoothly. Thus, I am assuming the water pump is not the culprit.
6) coolant is clearly circulating as the radiator becomes very hot, after the thermostat opens on a cold start.
7) I did not remove any of the “freeze plugs”, during the engine flush.
The engine was overheating rapidly, prior to the above repairs, and I am not sure that any of the above has made a major difference.
I currently have the hood removed and have only let the engine idle in my garage, since completing the above repairs. I am assuming this is not the root of my issue.

I am at a loss as to what to try next?

I would appreciate any thoughts or experiences of others.

Thanks
Jim