Not sure if this is part of the design but water was ejecting from a small port to the right (driver's side) and slightly lower than the hole pictured. (which I think is the flywheel cover?)

The radiator level has remained the same the last couple times this happened - which curiously have been after a rain?

I searched for overflow discharge ports but did not get results to explain. Looking in the online shop manual I'm not coming up with anything either.

Its a 1951 chevy 3600
Thanks
Rog
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