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'36 Dodge water pump question

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Got a question on the water pump. I've replaced the original pump with a new replacement pump but noticed a small detail. On the front on the head there is a large hole behind the pump. On  the rear cover of the original pump there was a 5/16 in. hole through the plate at the location of the hole in the head. On the replacement, there is no hole. Both plates have the cutout for the distribution tube. My question is, will not having that small hole in the cover make any difference in performance or does the plate need the  hole or even a larger one. Thanks for any info. Can't seem to find my old pump for comparison.

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