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  #31  
Old March 8th, 2023, 01:39 PM
Prowbar Prowbar is offline
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Default Re: V6 water pumps getting hard to find

Quote:
Originally Posted by LEWISMATKIN View Post
the pontiac impeller has somewhat taller blades, they are shorter in length, and are turned the opposite direction than the GMC pump. the pontiac impeller also has 3 large holes that surround the hub of the impeller.
Opposite direction? Rotation-wise or the way it pumps inside? The vanes face the same direction for the GMC and Pontiac pump?
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  #32  
Old March 13th, 2023, 07:38 PM
BobBray BobBray is offline
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Default Re: V6 water pumps getting hard to find

Pontiac V-8's up to 1959 had reverse-flow cooling, maybe that explains the different impeller:

http://www.pontiacsafari.com/EngineCooling/
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  #33  
Old March 14th, 2023, 08:01 AM
Prowbar Prowbar is offline
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Default Re: V6 water pumps getting hard to find

Interesting. Though the aftermarket water pump (GMB 1302835) I bought from Rockauto for a 1963 Pontiac Tempest with the 326ci V8 (which is past 1960, so the correct cooling system) is the suitable water pump for a light-duty V6. Vanes face the same way, and it is a direct bolt-in.
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  #34  
Old March 15th, 2023, 05:09 AM
BobBray BobBray is offline
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Default Re: V6 water pumps getting hard to find

BTW, Summit Racing has the GNB 130-2835's back in stock.
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