01-07-2019, 11:35 AM | #1 |
Member
Join Date: Dec 2018
Location: Bastrop County, TX
Posts: 73
|
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?
|
01-07-2019, 12:57 PM | #2 | |
Senior Member
Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,475
|
Re: 1979 F350 4x4
Quote:
Guess I should also ask if it overheats @ idle, slow traffic and/or highway.
__________________
***** - WHY IS IT ... - ... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag? WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order) |
|
Sponsored Links (Register now to hide all advertisements) |
|
01-07-2019, 01:59 PM | #3 | |
Member
Join Date: Dec 2018
Location: Bastrop County, TX
Posts: 73
|
Re: 1979 F350 4x4
Quote:
It will overheat if it idles once it is driven, but will begin to overheat rollin' down the road at 65. |
|
01-07-2019, 08:51 PM | #4 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,436
|
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.
|
01-08-2019, 01:56 AM | #5 | |
Senior Member
Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,475
|
Re: 1979 F350 4x4
Quote:
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?
__________________
***** - WHY IS IT ... - ... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag? WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order) |
|
01-08-2019, 06:31 AM | #6 |
Senior Member
Join Date: Jan 2012
Location: Roswell NM
Posts: 162
|
Re: 1979 F350 4x4
Sponsored Links (Register now to hide all advertisements)
|
01-08-2019, 09:18 AM | #7 |
Member
Join Date: Dec 2018
Location: Bastrop County, TX
Posts: 73
|
Re: 1979 F350 4x4
I'll check the vacuum advance. I may have disconnected it. My brother said it was NOT necessary and robbed me of performance. Hmmmmm
|
01-08-2019, 09:21 AM | #8 | |
Member
Join Date: Dec 2018
Location: Bastrop County, TX
Posts: 73
|
Re: 1979 F350 4x4
Quote:
|
|
01-08-2019, 09:24 AM | #9 | |
Member
Join Date: Dec 2018
Location: Bastrop County, TX
Posts: 73
|
Re: 1979 F350 4x4
Quote:
|
|
01-08-2019, 10:11 AM | #10 |
Member
Join Date: Dec 2018
Location: Bastrop County, TX
Posts: 73
|
Re: 1979 F350 4x4
Crankshaft pulley is smaller than the original. Installed a nice high-flow waterpump.
|
01-08-2019, 10:22 AM | #11 | ||
Senior Member
Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,475
|
Re: 1979 F350 4x4
Quote:
Quote:
The man makes a good point and yes it is needed unless the DIST has been re-curved to use centrifugal advance only.
__________________
***** - WHY IS IT ... - ... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag? WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order) |
||
01-08-2019, 11:10 AM | #12 |
Member
Join Date: Dec 2018
Location: Bastrop County, TX
Posts: 73
|
Re: 1979 F350 4x4
|
01-08-2019, 12:01 PM | #13 | |
Senior Member
Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 3,706
|
Re: 1979 F350 4x4
Quote:
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 |
|
01-08-2019, 06:18 PM | #14 | |
Member
Join Date: Dec 2018
Location: Bastrop County, TX
Posts: 73
|
Re: 1979 F350 4x4
Quote:
|
|
01-08-2019, 06:35 PM | #15 |
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. |
01-08-2019, 06:45 PM | #16 | |
Senior Member
Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 3,706
|
Re: 1979 F350 4x4
Quote:
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 |
|
01-12-2019, 08:30 PM | #17 |
Junior Member
Join Date: Mar 2011
Posts: 12
|
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. |
|
|
Sponsored Links (Register now to hide all advertisements) |
|