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Old 11-14-2019, 11:00 AM   #1
tjaybo
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Default holly 4 barrel carb linkage

I am putting a Mummert intake and holly carb on my 1955 club sedan with a fordo trans. I would like to know what others have done with carb and trans shifter and kickdown linkage.
Thanks
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Old 11-14-2019, 04:44 PM   #2
rotorwrench
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Default Re: holly 4 barrel carb linkage

You might want to consider going AOD. The Ford-O-Matic is a Borg Warner design that uses a throttle linkage control system to operate the throttle valve in the transmission it appears to be a kick down but it's a lot more than that. There was no vacuum modulation until the 60s so it was all done mechanically to get the ATF pressure levels needed to properly control the transmission throughout the range of operation. The AOD being a distant relation to the early Ford-O-Matic, uses a TV cable off the throttle linkage to essentially do the same thing as the earlier TV rod like your car has and it's easier to adjust.

There may be a way to make a TV cable work on the early transmissions but I've never seen it happen yet on this forum. If the original linkage will work on the new manifold & carb then a person could go that route. A C4 trans change would also put control back to the vacuum modulator but kick down is another situation. It's all been done before I'm sure.

You may also have to ditch the load-o-matic distributor and find a 57 or later distributor. The load-o-matic depends on the venturi vacuum set up from the original carb. Later carbs won't have that feature.

Last edited by rotorwrench; 11-15-2019 at 03:35 PM.
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Old 11-14-2019, 05:32 PM   #3
scicala
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Default Re: holly 4 barrel carb linkage

Why can't you just use the original throttle bell crank and put it on the Mummert intake ? That intake has a provision for the original bell crank to mount. Then see if the bell crank is higher or lower than the original intake manifold, and adjust the kick down rod length accordingly.


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Old 11-14-2019, 05:39 PM   #4
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Default Re: holly 4 barrel carb linkage

What I said above only applies if your original bell crank is for a 4 barrel engine.
Two barrel engines had the linkage on the back of the intake. Mummert's intake won't have anything to mount it on.


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Old 11-15-2019, 12:42 AM   #5
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Question Re: holly 4 barrel carb linkage

Is yours a 2V or 4v originally?
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Old 11-15-2019, 12:15 PM   #6
tjaybo
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Default Re: holly 4 barrel carb linkage

originally the car was a 2 barrel.
I had the fordo rebuilt at a cost of about $1300 so I would rather not have to do a conversion to an AOD.
I have replaced the distributor with a 57 compatible electronic.
My hope was to find someone who has gone down this route and can tell me how to solve some of the isssues.
Does an original 4 barrel set up work if I could find one?
Thanks
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Old 11-15-2019, 03:25 PM   #7
scicala
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Default Re: holly 4 barrel carb linkage

If you get a bell crank from a '55 or '56 four barrel Y-Block V8, it will bolt on and you will have to figure out the correct length for the kick down rod. I've seen bell cranks on EBAY before. An EBAY vendor (natolibird) Felix Natoli sells bell cranks for '57 engines. He may have something that works for you. I'm pretty sure he makes them (reproductions).


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Old 11-17-2019, 10:39 AM   #8
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Default Re: holly 4 barrel carb linkage

Thanks Sal, I will try to look him up
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Old 11-17-2019, 11:58 AM   #9
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Default Re: holly 4 barrel carb linkage

A 57 assembly will bolt on as well, but you will have to change your hardware that mates the kickdown rod to the assembly. 55 and 56 had an L shaped piece that you could use to adjust the height/length of the rod. 57's look more like a clevis but it too has a threaded boss that can increase/decrease your length on the kick down rod.
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Old 11-20-2019, 11:29 AM   #10
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Default Re: holly 4 barrel carb linkage

Thanks for that detail. I will see what I can find
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