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robib · 01-08-2019, 06:35 PM

If the crankshaft pulley is smaller than the original, as you stated, and the water pump pulley is stock (to a 460), then the pump is turning slower than it should. Find out what the diameters should be and replace that which is not correct. Start there.

Electric fans are fine as long as they are really pulling the CFM they claim and match what is needed by your application. Make sure the power wires are big enough to provide the proper power. Also, solid shrouds (obviously not where the fans are) can actually inhibit the flow of air as you are driving. Some shrouds have holes cut in them with rubber flaps that open as you drive. 460 engines were available stock in 79 Ford pickups. They used water pump driven fans and had no problems.

01-08-2019, 06:35 PM	#15
robib Member Join Date: Mar 2013 Location: Canton, Ct Posts: 36	Re: 1979 F350 4x4 If the crankshaft pulley is smaller than the original, as you stated, and the water pump pulley is stock (to a 460), then the pump is turning slower than it should. Find out what the diameters should be and replace that which is not correct. Start there. Electric fans are fine as long as they are really pulling the CFM they claim and match what is needed by your application. Make sure the power wires are big enough to provide the proper power. Also, solid shrouds (obviously not where the fans are) can actually inhibit the flow of air as you are driving. Some shrouds have holes cut in them with rubber flaps that open as you drive. 460 engines were available stock in 79 Ford pickups. They used water pump driven fans and had no problems.