Need help to id these 2V carbys - Ford Mustang Forum
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post #1 of 11 (permalink) Old 4 Weeks Ago Thread Starter
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Need help to id these 2V carbys

Recently I purchased 2 intakes with 2 Autolite carbys. Both intakes are 289 and dated November and December 1964. C5AE 9425 D.

The 2 carbys are similar but both have distinctive differences.
The one on the silver intake has the dashpot on the linkage. The tag reads C5ZF H A 4ME.
It also has a weird plug type hose that is where the PCV goes into the alloy spacer.
It looks like 3L and a venturi size of 1.23 on the clock face.
It also has a grommet covering a hole near the tag on the top of the fuel bowl that reveals a hole.

The other carb on the black intake has the dashpot on top of behind the butterfly.
Has a venturi size of 1.21 and no other numbers or letters that I can see.
Also has a cylinder with a wire coming out of it in front of the linkage.
This one has the PCV hose coming from the spacer which is also genuine ford like the other setup.
This one has no hole and no tag on the front bowl.

My workshop manual is a bit vague on description and looking online really didn't help much either.
Can somebody please tell me if these are correct for a 65 Mustang?




15/5/1964 260 Manual Coupe.
23/3/1965 289 Manual Fastback.

Last edited by Tony 64; 4 Weeks Ago at 06:03 AM.
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post #2 of 11 (permalink) Old 4 Weeks Ago
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Quote:
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Can somebody please tell me if these are correct for a 65 Mustang?
No and no.

The TAG would be correct for nearly anything 1965, including a Mustang, with a 289-C4 setup with a road draft tube instead of a PCV system. 4ME is a date code for 5th week of December, 1964. But there were ZERO carbs on a 289 with a 1.21 or 1.23 venturi. That tag should be on a 1.14 Autolite 2100 so who knows what you actually have. The larger venturi models were for big block engines.

On the front, left corner of each carb base flange, behind the dashpot making it hard to see, should be a stamped code that is probably 4 or 5 characters long. That should tell you what the carb actually was intended to be. Dashpots were on automatic transmission cars.

That covered hole in the float bowl was usually on later years as an emission control to keep fumes from evaporating out of the bowl so easily. They were first used on 2100 289s in 1967. The second one with raised top cover is even later yet. That isn't a dashpot on the back but a diaphragm to pull open the choke; again to prevent over-choking and high emissions. I don't think that throttle solenoid even came from Ford. Those both look like later year carbs for something like a 390 masquerading as a carb for an early Mustang.

A larger venturi carb on a 289, or worse yet a 260, probably makes it run WORSE than using a correct one. Bigger is not better since the internal booster venturi isn't designed for the smaller air flow. The 260s used a 1.01 carb.

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I have to agree with Ivy. These may "work" on a '65 but they aren't the correct ones. They look almost the same as the 2V on my 1970 390 engine in my Cougar. I'll check my '66 Service Manual to see what a 289 carb should look like.
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post #4 of 11 (permalink) Old 4 Weeks Ago Thread Starter
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Thanks Ivy.
I brought them in a package deal so not really intended to install them. I have yet to clean them up but when I do, I will see if there are any numbers on the base.

15/5/1964 260 Manual Coupe.
23/3/1965 289 Manual Fastback.
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The book on SBFs gets into all these carbs, but mine is out in the barn, so it will have to wait until morning. But the solenoid on the second one was used if AC was installed and would keep the RPMs up a bit at idle.

1968, hardtop, 289, C4, seafoam green.
1966, hardtop, 289, original 3 speed, on the road and fun to drive.
1968, hardtop, 200, 3 speed, in work.
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I run an idle compensator solenoid similar to the one pictured. Works great with A/C.

1965 Mustang Coupe
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post #7 of 11 (permalink) Old 4 Weeks Ago Thread Starter
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Double posted.

15/5/1964 260 Manual Coupe.
23/3/1965 289 Manual Fastback.

Last edited by Tony 64; 3 Weeks Ago at 04:20 PM.
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Quote:
Originally Posted by Ivy66GT View Post

On the front, left corner of each carb base flange, behind the dashpot making it hard to see, should be a stamped code that is probably 4 or 5 characters long. That should tell you what the carb actually was intended to be. Dashpots were on automatic transmission cars.
Ivy.
Here are the pictures of the numbers you mentioned.

The silver intake carb with 1.23 venturi reads C4MF U.

The black intake carby with 1.21 venturi reads 1AX4. The 4 might also be an A.
There is also a 5 stamped in front of the number.

15/5/1964 260 Manual Coupe.
23/3/1965 289 Manual Fastback.
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Quote:
Originally Posted by Driveway View Post
The book on SBFs gets into all these carbs, but mine is out in the barn, so it will have to wait until morning. But the solenoid on the second one was used if AC was installed and would keep the RPMs up a bit at idle.
Hi Driveway,

Did you manage to have a look at that book?

15/5/1964 260 Manual Coupe.
23/3/1965 289 Manual Fastback.
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Quote:
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Did you manage to have a look at that book?
It won't help. These were big block carbs and the SBF book only covers small block engines as implied by 'SBF'.

Neither of those numbers are in the 1975 Ford replacement parts catalog either. Googling the first one turns up sellers with a factory C4MF-U tag saying they were from a 390 engine which would be as expected.

https://www.ebay.com/itm/1966-Ford-G...-/163298104795

The second one is probably D1AX-A which I can't find anywhere but the venturi size tells you its not for an SBF. The last character was always a letter and not a number and that '5' is for an unknown 'something else'.
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Thanks Ivy.

15/5/1964 260 Manual Coupe.
23/3/1965 289 Manual Fastback.
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