1968 f100 bugout project

[Az68f100]

Quite a nice restoration there. 

I have a friend who has a Pickup somewhere around that vintage.  He found a totaled Lincoln and bought
the 460 out of it.   I think it had a big 2bbl carb.   He claims he got better gas mileage with the larger motor.
His aim was to tow a 5th wheel camping trailer with his set up. 

But that should be a nice bug out when you get her done.

As much as it is costing me it better be lol.

 

[Az68f100]

A little more progress this weekend.  I built some sawhorses so I can work on the camper shell easier.  Next week I will start to replace some rotten wood and treat the rest.



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[Telcobilly]

Very cool '68. Hats off to you for getting it back on the road. I prefer older vehicles to the newer plastic spaceships they call cars..lol
Keep the updates coming..

 

[idn88]

A true story of love at first sight.

A 390 CID Ford w/ AFB 750 CFM 4v has never met a fuel station it did not like.

I think the original steel 2bl manifold from a slightly newer commercial 360 or 332 engine will fit - then you could go back to the motocraft 2barrel carb and would likely get something around 15 to 16 MPG - depending on your rear gearing.  

Very awesome rig.  Had one somewhat similar - 1975 vintage I believe - way back when.  Wish I still had it.

 

[highdesertranger]

you will get better fuel economy with the CORRECT 4bbl carb then you will with a 2bbl. highdesertranger

 

[idn88]

you will get better fuel economy with the CORRECT 4bbl carb then you will with a 2bbl.  highdesertranger

Define CORRECT.  The factory carb on a 1968 ford FE 390 truck was a motocraft 2bl carb.

It appears to still have a cast iron manifold, so I am assuming its some flavor of OEM 4bl manifold from a car, or maybe that spacer under the carb goes back to 2bl intake.  If the Cam is no longer stock then the carb / manifold needs to be matched with the carb either way.

A 4 Barrell will most certainly not get better mileage.  Whether its vacuum or mechnical secondaries, as soon as the secondaries kick in the injection pump will spray raw fuel in to the plenum - definitely not a plus for mileage.    Performance is a whole other issue.

 

[highdesertranger]

ok here goes, a carburetor needs to match it's air flow with what the engine is capable of using. this is measured in cubic feet per minute(CFM). what ever size engine the CFM of the carb must match the engines max CFM. the larger the CFM of a carb the more gas it uses. so if you only have a 2bbl carb you must have 2 very huge throats in the carb to match the engines max CFM. on a 2bbl this is your only option if you try to use a smaller CFM carb you will starve the engine at full throttle. so now on to the 4bbl carb, a 4bbl carb can get the large CFM with 4 smaller throats in fact 1/2 the size as a 2bbl. what this allows you to do is to drive around basically on a much smaller carb because most of the time you are only using the 2 front throats. it's like you to installed a 2bbl carb that was 1/2 the CFM of the 2bbl. that came with the 390. you will have much better throttle response at low end and much better fuel economy. then when you need the full CFM flow of the carb under full throttle the secondary's kick in. to give you full CFM. I have owned a few of the 390 2bbl set ups in a truck I was lucky to get 10mpg. once a 4bbl was installed with the correct manifold this would go up to maybe 12 mpg. but have much better throttle response. btw a spread bore 4bbl makes this even more pronounce because the primaries are even smaller CFM flow, the total CFM is made up by even larger secondary's. hope that clears it up. highdesertranger

 

[B and C]

x2 on what HDR just said.