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GMC V6 and V12 Engines Engine repair and rebuilding

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Old December 31st, 2020, 07:42 PM
turbobill turbobill is offline
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Truck: 1968 HM80 with a 478M and a few engines plus a Toro-Flow
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Default Re: 1966 4000 351 water pump

Quote:
Originally Posted by BobBray View Post
There are basically 2 water pumps for the V-6's, one has a threaded shaft and the other has a flange with 4 threaded holes. It is true that most of the time V-6's with air brakes use the pump with the threaded shaft, but be advised I have seen V-6's with air brakes that used the pump with the flange.
Actually three.

The Toro Flow uses a larger hub pilot diameter. I had to borrow the water pump off my Toro Flow for my 478M in my dump truck.
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