V6 water pumps getting hard to find

[Prowbar]

Originally Posted by LEWISMATKIN

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?

[BobBray]

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

http://www.pontiacsafari.com/EngineCooling/

[Prowbar]

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.

[BobBray]

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

[KiwiGMC]

Hi there, new to the forum. Ive got a 66 with a 351E in it, trying to locate a water pump among many other parts. ANy one have any ideas

[Funky61]

Welcome to the Forum KiwiGMC!

This one listed for the 305 V6, dimensionally the same as the 351.

https://www.oreillyauto.com/detail/c...ter+pump&pos=0


eBay Big Bucks

https://www.ebay.com/itm/17460755653...Bk9SR4aPxZejZA

[BobBray]

The 4 bolt flange water pumps are out there, you just need to hunt a bit. Try looking up a water pump for a '57 Pontiac Star Chief with a 347 V-8, the pump listed for that car these days is the same one for a GMC V-6. Lewis Matkin pointed this out earlier and he is right.