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I noticed when browsing through pump rebuild kits from a Corvette supplier that there was a different kit for 65 pumps that is supposed to have a pump bearing/shaft that is 3/16 shorter than the 66-67 pump kits. What was the difference here? Was there a different part number for the pump in 65, or was there a change in hub installed heights? Am I correct that 65 and 66 BB's shared the same water pump and crank pulleys?
Thank you,
Steve
There should be no difference, at all, between 1965 and 1966 big block waterpumps. Both pumps used casting GM #3856284 and both were of assembly part number GM #3876173. The rear backing plate of the pumps changed which MIGHT affect the shaft length, but I as I recall, this change occurred after 1966. So, I don't see why there would have been any difference between 1965 and 1966 pumps.
Waterpump pullies were the same for 1965 L-78, 1966 L-36, and 1966 L-72. Crank pullies were the same for all three applications, as well.
From what I can tell, the hub spacing dimension for the waterpump flange was 5-3/4" for all 1965-69 Corvette big block waterpumps.
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