Quote:
Originally Posted by LEWISMATKIN
The pontiac pump had a different impeller---all aftermarket replacement new pumps use the gmc impeller in both applications. I have had both and the gmc pump will install on the early '63 pontiac timing cover.
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If I'm understanding it right - a NOS Pontiac pump will not work on a GMC because of the impeller clearance - but an aftermarket pump will fit either the Pontiac and GMC - so the housings are the same. Is the Pontiac impeller deeper, larger around or what. So the old guy was correct in a way.
