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Old 10-05-2008, 06:53 PM
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Fan Clutch?

I'm working on the cooling side of my 350 SBC in a 71 pick up. The truck right now has a stock 350 with a fan clutch and a short water pump. I went with a long water pump on the new motor because it was free and all the brackets for accessory's that I bought are for a long water pump. Now, I want to keep a mechanical fan, because of cost. Can I get away with just reusing the fan and buying a new fan clutch for the truck, or am I asking for trouble with the switch to a long pump and thus moving the fan that much further into the shroud? Would it be better to just run a fan and an aluminum spacer and have the fan a direct drive, approximately the same distance in that the fan is now? Thanks a bunch for any help you all can be.

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Old 10-05-2008, 07:33 PM
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I never recommend a direct drive fan! I know Ford did it for years but it's such a killer on mileage, not to mention the noise and un-necessary power needed to spin it full time.

A good thermostatic fan clutch works well. You can try mounting up your clutch on the new pump and see were it sets in reference to the shroud. You can get one a little shorter but not sure if it will be enough if it's now too close.
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Old 10-05-2008, 07:37 PM
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thanks for the fast reply, im not sure if it is to close or not, I just figured it would be closer because of the difference in length of a short and long pump. Is there an "ideal" amount a fan should or should not be inside the shroud? If with a new clutch the fan is to close in, could I just make a spacer that would space the fan away from the clutch, thus moving it out of the shroud, that is if the fan is mounted on the engine side of the clutch and not the radiator side
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Old 10-05-2008, 07:44 PM
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Is this new long water pump, and accessories for a 'v' belt system, or a serpentine belt system?
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Old 10-05-2008, 08:06 PM
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it's a v belt set up
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Old 10-05-2008, 08:22 PM
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With the 'v' belt your old fan clutch should work.

I also would recommend a shorter fan clutch, instead of a solid fan. The fan should be mounted directly to the fan clutch. (no spacer)
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Old 10-06-2008, 06:52 AM
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how can i go about finding a shorter fan clutch? Just go to the parts store and look up one for my truck and see what happens? Or is there a better resource for looking this up.
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Old 10-06-2008, 07:11 AM
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Take your old fan clutch, and fan in to a parts store. Order a fan clutch, for the long water pump application. It should be shorter.

Check it's fan mounting bolt pattern, the water pump flange should be the same.
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Old 10-06-2008, 08:03 AM
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if the old pump was working fine and all the pulleys line up correct put it back on....

the long shaft pump is not a "free" part if you need to buy $$ fan parts to make it work!!!!
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Old 10-06-2008, 08:52 AM
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Be very careful when changing fan clutches. You need to make sure the center hole in the fan clutch is the SAME size as the water pump center dowel.

A fan clutch with a bigger hole will go on a small diameter center dowel water pump but will fly off at higher rpms. This will destroy the water pump, belts, shroud, and radiator. Please don't ask me how I know this.
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Old 10-06-2008, 09:51 AM
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ooo sounds rough, the old pump is toast and so are all the accessory's on the truck right now. So thats why I went with the current set up, and I like the alt on the opp. side of the power steering pump
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