How bad is this?

One part of this Forum's Model A Religion is:

Dissolved minerals in water, plus dirt, plus old rust deposits from an 80+ year old engine block can "totally" plug many radiator tubes with 100% blockage ..... to where no water can flow.


Question now is:

With no water flow through this plugged opening for many years, will removal of the manifold cause it to leak?

Or, maybe, will removing a radiator cap unplug a radiator tube that is plugged?

Sounds crazy, but only time will tell.

Rest assure that we all wish for the best of luck.
 
It's probably a freeze crack from about 1940 and is now being seen for the first time! I agree with putting in some sealer and running it to see what happens.
 
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