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My water pump was leaking on my 1967 318 engine, when I went to take it off the pump blades were smashed and 3 are gone. The pump blades also carved there way into the pump about an 1/8 of an inch. The pump is replaceable but should I go looking for the fan blades? This is the water pump
Sounds like the bushing that centers/holds the shaft in place is gone.
I'd just replace the whole thing with a new high flow unit, especially since the housing was damaged.