Out of the factory, I would think that the water pumps were manufactured with the impellers accurately pressed onto the shaft, probably unlike what we get from rebuilders. 50+ years later, how many untouched water pumps still exist?
Is there any evidence that most stock engines operated well with large impeller-to-plate clearance? I doubt it.... that’s contrary to the design of the type of pump. Proper clearance is mandatory for proper operation. In my case specifically, simply reducing clearance made a substantial improvement in cooling.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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