The pumps have the same cast number on them. The only difference is the impeller. Any V8 4 bolt pump will work on any 370,389,421, etc, etc. Post up that 4 cyl pump in the 61-63 Tempest forum. Someone will take it off your hands!
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Keith Collier
61-63 Pontiac Tempest
Tech advisor
POCI.org
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