4 or 5 years ago on this forum there was a thread on the 62 & 63 Tempest water pumps and in that thread there were photos of the back sides of pumps side-by-side and there was a specific 4 cyl water pump (for both '62-63 4 bolt and '63 8 bolt timing covers).
Something about the fins on the back of the impeller were different between '63-326 V8 cars and the 4 cyl. Either shorter fins and/or fewer of them.
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Peter Serio
Owner, Precision Pontiac
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