Engine Swap Questions
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Engine Swap Questions
Hey Guys I've got a 1968 F600 currently with a non running 391 which was not the original engine. It originally came with a 330 MD. I was curious as to what Engine would be best to replace it with, because there aren't any rebuild kits out there that are for the 391. So what are your opinions
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Welcome to FTE.
330 HD, 361, 391 will all interchange. Intake and accessory drives should swap right over.
Overhaul kit:
Ford 391 3 Ring Piston Engine 1966-1978 | Northern Auto Parts
I found more on e-bay.
What are you going to do with the truck? What else needs a rebuild? Budget?
Checked the brakes and tires yet? You can easily "triple the value" of a truck like this with new tires and brakes, let alone an engine.
330 HD, 361, 391 will all interchange. Intake and accessory drives should swap right over.
Overhaul kit:
Ford 391 3 Ring Piston Engine 1966-1978 | Northern Auto Parts
I found more on e-bay.
What are you going to do with the truck? What else needs a rebuild? Budget?
Checked the brakes and tires yet? You can easily "triple the value" of a truck like this with new tires and brakes, let alone an engine.
Thread Starter
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New User
Joined: Oct 2014
Posts: 18
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Welcome to FTE.
330 HD, 361, 391 will all interchange. Intake and accessory drives should swap right over.
Overhaul kit:
Ford 391 3 Ring Piston Engine 1966-1978 | Northern Auto Parts
I found more on e-bay.
What are you going to do with the truck? What else needs a rebuild? Budget?
Checked the brakes and tires yet? You can easily "triple the value" of a truck like this with new tires and brakes, let alone an engine.
330 HD, 361, 391 will all interchange. Intake and accessory drives should swap right over.
Overhaul kit:
Ford 391 3 Ring Piston Engine 1966-1978 | Northern Auto Parts
I found more on e-bay.
What are you going to do with the truck? What else needs a rebuild? Budget?
Checked the brakes and tires yet? You can easily "triple the value" of a truck like this with new tires and brakes, let alone an engine.
Super Moderator
Joined: Apr 2004
Posts: 34,513
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You can put a 460 in there, but you will be on your own to fab up mounts and figure out a transmission. You could probably put a ZF in there.
The 460 will give you plenty of power, but if you are going to run this thing with max loads, you will have to be a little lighter on the load pedal so as to not overload the rest of the drive train or run the 460 so hard as to over heat it or worse.
Then there is the excellent steering and brakes. As OEM, these things were best held to about 60 mph. You'll figure that out.
IMO you need to budget a pretty fair amount of money on this. Brakes and tires will be pretty expensive. Does this already have tubeless? Not sure a '68 would still have the widow maker wheels. Are you familiar with those?
The 460 will give you plenty of power, but if you are going to run this thing with max loads, you will have to be a little lighter on the load pedal so as to not overload the rest of the drive train or run the 460 so hard as to over heat it or worse.
Then there is the excellent steering and brakes. As OEM, these things were best held to about 60 mph. You'll figure that out.
IMO you need to budget a pretty fair amount of money on this. Brakes and tires will be pretty expensive. Does this already have tubeless? Not sure a '68 would still have the widow maker wheels. Are you familiar with those?
Thread Starter
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New User
Joined: Oct 2014
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You can put a 460 in there, but you will be on your own to fab up mounts and figure out a transmission. You could probably put a ZF in there.
The 460 will give you plenty of power, but if you are going to run this thing with max loads, you will have to be a little lighter on the load pedal so as to not overload the rest of the drive train or run the 460 so hard as to over heat it or worse.
Then there is the excellent steering and brakes. As OEM, these things were best held to about 60 mph. You'll figure that out.
IMO you need to budget a pretty fair amount of money on this. Brakes and tires will be pretty expensive. Does this already have tubeless? Not sure a '68 would still have the widow maker wheels. Are you familiar with those?
The 460 will give you plenty of power, but if you are going to run this thing with max loads, you will have to be a little lighter on the load pedal so as to not overload the rest of the drive train or run the 460 so hard as to over heat it or worse.
Then there is the excellent steering and brakes. As OEM, these things were best held to about 60 mph. You'll figure that out.
IMO you need to budget a pretty fair amount of money on this. Brakes and tires will be pretty expensive. Does this already have tubeless? Not sure a '68 would still have the widow maker wheels. Are you familiar with those?
Super Moderator
Joined: Apr 2004
Posts: 34,513
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360 is an FE. Your 391 is an FT.
FT has a larger crank snout, and uses a cast iron or steel front cover which is also an engine mount. The FT also uses the bell housing as the rear engine mount.
Wheels: second link in post 1, and the link in post 7 will give you pics of the dangerous wheels.
https://www.ford-trucks.com/forums/1...ification.html
Flywheel: This deals with the flywheel issues between FE and FT motors:
https://www.ford-trucks.com/forums/1...ap-clutch.html
5 and 2 is a good set up.
Good luck with it.
FT has a larger crank snout, and uses a cast iron or steel front cover which is also an engine mount. The FT also uses the bell housing as the rear engine mount.
Wheels: second link in post 1, and the link in post 7 will give you pics of the dangerous wheels.
https://www.ford-trucks.com/forums/1...ification.html
Flywheel: This deals with the flywheel issues between FE and FT motors:
https://www.ford-trucks.com/forums/1...ap-clutch.html
5 and 2 is a good set up.
Good luck with it.
Laughing Gas
Joined: Jan 2008
Posts: 1,027
Likes: 4
I built my 391 into a 390/391...
lower is 391.. upper is 390.. which allowed me to use 390 heads... aluminum intake .. billet electronic distributor... stainless valves etc...
My build is nearing completion... look for project "lil bit"... youll be sure to like it.. my 1973 f600 resto
Pictures now posted under my thread "tie rod source 1973 f600"
lower is 391.. upper is 390.. which allowed me to use 390 heads... aluminum intake .. billet electronic distributor... stainless valves etc...
My build is nearing completion... look for project "lil bit"... youll be sure to like it.. my 1973 f600 resto
Pictures now posted under my thread "tie rod source 1973 f600"
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New User
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360 is an FE. Your 391 is an FT.
FT has a larger crank snout, and uses a cast iron or steel front cover which is also an engine mount. The FT also uses the bell housing as the rear engine mount.
Wheels: second link in post 1, and the link in post 7 will give you pics of the dangerous wheels.
https://www.ford-trucks.com/forums/1...ification.html
Flywheel: This deals with the flywheel issues between FE and FT motors:
https://www.ford-trucks.com/forums/1...ap-clutch.html
5 and 2 is a good set up.
Good luck with it.
FT has a larger crank snout, and uses a cast iron or steel front cover which is also an engine mount. The FT also uses the bell housing as the rear engine mount.
Wheels: second link in post 1, and the link in post 7 will give you pics of the dangerous wheels.
https://www.ford-trucks.com/forums/1...ification.html
Flywheel: This deals with the flywheel issues between FE and FT motors:
https://www.ford-trucks.com/forums/1...ap-clutch.html
5 and 2 is a good set up.
Good luck with it.
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Laughing Gas
Joined: Jan 2008
Posts: 1,027
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Best of both worlds
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New User
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So I can't use my 391 Block?I was hoping I could do a rebuild,in my Garage!
Laughing Gas
Joined: Jan 2008
Posts: 1,027
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I would suggest.. based on money only a careful rebuild... in my case I had a 330 and I wanted a larger motor.. and the 391/390 combo was around 3500 dollars are dressed out and done right
I looked at just building the 391.. and done right it came in at about 2500.. so for me getting a better performing motor with lighter more modern parts made the decision easy .. I lost nearly 100 pounds on just the intake...
A 391 is an excellent motor.. my 390/391 will run away from one.. but Im also a one owner driver and the truck will be babied by me
I looked at just building the 391.. and done right it came in at about 2500.. so for me getting a better performing motor with lighter more modern parts made the decision easy .. I lost nearly 100 pounds on just the intake...
A 391 is an excellent motor.. my 390/391 will run away from one.. but Im also a one owner driver and the truck will be babied by me
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https://www.ford-trucks.com/forums/1375496-391-ft.html
Or can he use the FT distributor with an FE intake?
Elder User
Joined: May 2004
Posts: 565
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From: saxton pa.
FT vs FE
As far as swapping distributors between FE/FT here's how it goes . A FE distributor has a 1/4 in oil pump drive, the FT has a 5/16inch oil pump drive. So to use a FE dist in a FT you must install a bushing in the block and change the oil pump and drive to the FE style 1/4inch. To use a FT dist in a FE block you must have the block bored to FT diameter and convert to FT oil pump and drive. At one time you could buy a oil pump shaft that was 1/4in on one end 5/16 on the other. As stated the difference in crank snouts is problematic in using a FT timing cover on a FE but it can be done. There is a seal that fits the FT cover and the FE seal sleeve. Also the FE seal sleeve must be machined deeper to fit. A 330 MD FT flywheel can be used on a FE when installing in a FT application. FT exhaust manifolds can be used on a FE if the center port is welded shut.
Have A Good Day ==== Hotwrench
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