1979 F350 4x4 This may be too new a truck to discuss. I have a '79 F350 4x4 that originally had a 400M and C6. I removed the 400M and replaced it with a 460 bored 60 over with 68 460 heads, 270 4x4 Comp cam. I have a 4 core aluminum radiator with the biggest electrical fans available, oil cooler, and trans cooler. When the 400M was installed, it ran about 180, but now during the summer, it'll creep up to 225. Any ideas to keep this ol' girl running cooler?
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Guess I should also ask if it overheats @ idle, slow traffic and/or highway. |
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It will overheat if it idles once it is driven, but will begin to overheat rollin' down the road at 65. |
Re: 1979 F350 4x4 You might want to do a pressure test or maybe even an exhaust gas test just in case there is a leak somewhere. I know that 460s can be bored that far and generally with no problems but if there is a leak or even a cracked head, there will be constant problems.
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It sounds like poor air-flow or a weak WP. Thermostat good and of quality? Possible collapsing lower hose? All air out of the system? Coolant recovery system? Like mentioned, perform a pressure test. Does it lose coolant? |
Re: 1979 F350 4x4 Check your vacuum advance on the distributor. I had similar problem with my 460, advance wasn't working. I installed new one problem solved.
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Re: 1979 F350 4x4 Crankshaft pulley is smaller than the original. Installed a nice high-flow waterpump.
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The man makes a good point and yes it is needed unless the DIST has been re-curved to use centrifugal advance only. |
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A vacuum advance does not rob you of any power. When I worked in the 80's at Roush, we were dyno'ing some 460 Ford engines and more than one person noticed the exhaust temps were higher than other engines. The vacuum advance will allow more spark advance when cruising (light to moderate loads) which in turn lowers exhaust temps considerably. Sal |
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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. |
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On a stock 460, the base ignition timing is from 6 to 10 degrees depending on the year. This at about 600 RPM idle with the vacuum advance disconnected. To check total centrifugal advance timing, leave the vacuum advance disconnected and with the trans in park or neutral open the throttle and see at what RPM the advance stops increasing. Ideal would be from 30 to 35 degrees total by 2500 to 3000 RPM. To change the speed you reach total advance, you would need to change the advance springs in the distributor. I'm sure your probably good to go with the distributor you have. Sal |
Re: 1979 F350 4x4 Ditch the electric fans and find a mechanical fan from a big block Ford truck engine.
Electric fans are fine for an econobox, but the small electric motors they employ aren’t adequate to deliver the power required tp push enough air to cool a big block engine. Take a look at the fans in a newer F350 and compare them to what you have now. |
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