I have a '65 F-100 short-bed,single-barrel, straight-six, hand choke. My father-in-law used the choke right off the showroom floor. The truck always stumbled on take-off and again on any rapid acceleration. He adjusted to it's quirks and drove it 35 years like that. It was dealer maintained and they never corrected the fault for him.
I see that someone is suggesting a two barrel Holley 350cfm conversion from the single-barrel, but there was no mention of cubic inches, or even if a six cyl. would fit the case. My grandkids are afraid of having it die in an intersection.
The carb has been rebuilt many times with the same results??

 

Man, I feel like a fish taking the bait. This topic can be long winded.

I too have a 65 SWB F100 with a 240. If yours has the original Autolite 1101 carb, they are renowned for stumbling and troubles when you punch it. I tried fixing mine, then went to a Carter YF, which is defintely a better carb (and simpler). But the carter has some extraneous issues, like not being compatible with a loadomatic distributor, trouble finding a nice aircleaner to fit, and getting the choke linkage adapted (the accellerator cable will swap over to the Carter very easily).

Now, I am trying to go back to concourse stock, so I am working on the Autolite again.

If you want performance: Get a different intake manifold and swap on a small 2bbl or 4 bbl carb.

If you want economy: Find a Carter YF with manual choke, rebuild it once or twice, get a aircleaner from a car or later model truck with a carter (or Mr. Gasket has one that fits, sort of), deal with the manual choke linkage, and you are rolling.

If you want originality, you can TRY to rebuild an original 1101 Autolite with spark advance valve for the loadomatic distributor, but from what I hear, your troubles will persist (as mine have). www.ponycarbs.com will rebuild the carb for like $180 and they have a decent to good reputation (MUCH MUCH better than what you will get from a car parts place). They supposedly fix the hesitation that you describe, with some modifications, whatever that means.

Read about loadomatic over at www.fordsix.com in the small block six section. If your 65 has a 240, it was one of those 65 and 66 sixes that got loadomatic carb/dizzy setups. You need to understand this, as MANY of these setups have been screwed up through the years and they no longer run right.

 

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CDHerman:

So THAT'S why my truck has a later-model paper air filter!!

I recently got a '66 F250 with a 300 six, and wondered why it has a paper filter, rather than the oil bath. Thru trying to identify the carb so I could rebuild it, I deduced that it is NOT an Autolite 1101.

So the PO installed a Carter, and hence the later-model filter (which doesn't quite cinch down as securely as I'd like to the carb throat)!

And as long as it sat, and as varnish-coated and leaky-looking as the carb is, it starts with a touch of the key, has NO throttle hesitation, and still gets 11-12 mpg 50/50 town/hwy.

Hard to believe someone would put up with 35 yrs of an off-idle flat spot.

 

well you might whant to look into getting a webber a maybe. For smaller motors they are it in my opinion. thier good to work whith and easy to tune. I have been running a 32/36 prtegresive carb whith great results on my little Isuzu daily driver for almost 15years asnd i plan on running a slightly larger webber 2bbl on my 300. Clifford performance has linkage adapters for em too

 

if ya need a great carb guy for a totaly restored carb get ahold of my freind dayton at www.kineticperformance.com he has done 4 carbs for me and they work and look better than new i just cant say enuff about how good this guy is with carbs any thing from bone stock resto to way outhere wild and his prices are real resonable

 

Thanks for the info. It's good to know someone else has been there. I got a 350 cfm Holly,,in the box. It came from the local Holly expert, via swap-meet. Very cheap, but the adapter block wasn't drilled deep enough to accept the short studs on the manifold. The old manifold is too fragile to attempt a replacement so I'm having the adapter drilled deeper to accept the shorter studs. The accellerator and choke linkages are a head scratcher too.

 

Thanks for the input. The Holly runs great, no hesitation or stumbling and surprisingly the throttle linkage fit with very little bending and adjustment of the mount, even though the throttle rod was 90 degrees to the original position. While the choke cable is too short and must be replaced, we found that a couple of quick pumps of the accelerator makes the choke unnecessary when starting.
We are very happy with the acceleration too. It's always good to invest in something that actually works.