[Bluepen]

I'm working on a '46 Chevy Panel with a '78 SBC 350. Its got the orginal style radiator, all copper & brass, in it and the fan to radiator clearance is to close for me right now, less than 1/2". The PO had a flex fan setup for the motor but I want to go to a clutch fan. I can get my clearance, it will be 3/4" or better, if I go from the long water pump to a short pump. I looked at a short pump from a '78 Corvette 350 engine but don't know anything about the flow rates. If I change it over will it hurt, help or even work alright?

Thanks
David

[Mr Ed]

to the best of my knowledge both the Chevrolet standard short and long pumps flow the same. Only the aftermarket Edelbrock performance pumps have more flow and better impellers. I've swapped a few in my time and no difference between the two.
You could also fit an electric fan instead of running a waterpump driven fan and save a couple of horsepower.

[poncho62]

If you go with the short pump, you have to change alternator location, change pulleys, different brackets etc. Is there a spacer on the fan you can get rid of or change to get more clearance? Maybe space the rad ahead a little.


Looked at your journal......lose the spacer, or at least get a shorter one.

[68NovaSS]

The Corvette pump probably has a 3/4" shaft stub for the fan, normal 350 pump is 5/8".