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Just a general note here. Especially with water pumps and starters (and carbs for that matter too), one is only "matching" the case number. The guts are what really "make" the part number.
Starters: Best of my knowledge, there were two basic V8 starters (at least '65-'70 era). A "regular" and a higher torque version. The part numbers may have changed over the years, but it was still basically the same two. When you bought a starter, you had 3 options:
1. New
2. "Factory" rebuild (all guts replaced), done through GM.
3. "Local" rebuild (whatever didn't work was replaced) sometimes as good as a factory rebuild.
Case numbers were totally ignored in any rebuilds. So unless you have a *known* original or new one, what's inside could be anything.
Water pumps: They are still rebuilding correct '60s numbered water pump cores. I recently ordered one at Murrays. Cheap as a water pump comes. I wanted it to be a correct numbered one for my '69 442. I asked them when I ordered it, if I don't like it when it comes in (meaning if it isn't the right casting number) can I refuse it, they said sure. It came in with the correct casting number.
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