If you have a Factory 63 tech manual, go to page 6A-2 There are pics of the 2 different 4 bolt water pumps. I know it was mid year 63 that they went to the 8 bolt cover. I dont doubpt that the pumps got swapped around & caused all sorts of over heat problems, especially for the V8's!!!
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Keith Collier
61-63 Pontiac Tempest
Tech advisor
POCI.org
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