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Parts Wanted WTB a Autolite 4300-A carburetor

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Dirconmach1

Well-known member
Joined
Nov 14, 2019
Messages
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8
Location
Fort Valley,Virginia
My Car
1971 Mach 1 351 Cleveland, 4 barrel, ram air, 4 speed, factory a/c, 77 k original miles in bright red with black.

Drive it like you stole it!
Sorry for the confusion with my last WTB post. From what I am told I looking for a Autolite 4300-A carburetor. My car is a M coded 1971 Mach 1 with original 351 Cleveland 4 barrel car. It has the original cast iron manifold and 4 speed. Built 7/71. Mostly original except for the paint and steering wheel. This isn’t a show car but a very nice driver. The correct dated carburetor would be nice, but not necessary. I’m looking for a rebuilt or good core that can be rebuilt. Thanks to everyone for there input and setting me straight. Please PM me if you have one. Thanks
 
Sorry for the confusion with my last WTB post. From what I am told I looking for a Autolite 4300-A carburetor. My car is a M coded 1971 Mach 1 with original 351 Cleveland 4 barrel car. It has the original cast iron manifold and 4 speed. Built 7/71. Mostly original except for the paint and steering wheel. This isn’t a show car but a very nice driver. The correct dated carburetor would be nice, but not necessary. I’m looking for a rebuilt or good core that can be rebuilt. Thanks to everyone for there input and setting me straight. Please PM me if you have one. Thanks
Hi

I thought all 1971 and up Mustangs with 4v Clevelands had a Spreadbore Intake and the factory carb was a 4300D, 715 CFM spread-bore (manufactured from 1971-1974).

With that said, I have a 1973 H-code - 2v Cleveland and I wanted to replace it with a 4v and have it look completely stock. After some research, I went with a 4300A, 600 CFM (1968-1974). I stayed away from the 441 CFM version of the 4300A due to its limited flow, and opted for a 600 CFM version of the same released in 1968.

I have mine professionally rebuilt, and it has been very reliable, and my mildly modified Cleveland with Aussie heads, Dished Pistons, and an Edelbrock Performer Intake work well together. I think the 441 CFM would be too small on anything but a bone stock 2v Cleveland, but the 600 CFM is plenty for a street car. It has been very reliable from my experience over the past 6 years, I have no complaints.

4300A General Criticism...
Both variants of the 4300 have been criticized for poor acceleration, rough operation, and a potential for fire due to a poor fuel inlet design. This negative reputation is not universally accepted amongst users of these carburetors.

For what it's worth, here are details on the 4300 Carbs - A 441 CFM & 600 CFM (Squarebore), and the 4300D 715 CFM Spreadbore.

The Autolite-Motorcraft 4300 carburetor


4300A, 441 CFM (1967-1969)


The first version of this carburetor was released in 1967, replacing the 4100 on all Fords excluding the police package 428 CID and 289 CID high-output engines.

4300A 441 CFM specs:
1" primary venturi
Primary throttle bore: 1-7/16"
Secondary throttle bore: 1-9/16"

The 441 CFM carburetor was found to run too lean for the 390 CID engines; hence, the 600 CFM 4300A was developed the following year for these larger applications. The 441 CFM 4300A was discontinued after the 1969 model year in favor of the two-barrel Autolite 2100 carburetor.

4300A, 600 CFM (1968-1974)

Due to the limited flow of the 441 CFM version of the 4300A, a 600 CFM version of the same was released in 1968. By 1970, it was factory supplied on most Fords equipped with a big block 429 and 460, in addition to some vehicles with a 351 Cleveland.

4300A 600 CFM specs:
1.25" primary venturi
Primary throttle bore: 1-9/16"
Secondary throttle bore: 1-11/16"

4300D, 715 CFM spread-bore (1971-1974)

In 1971, a much more pronounced spread-bore design was released, dubbed the 4300D. They are incompatible with other spread-bore intake designs.

4300D 715 CFM specs:
1.25" primary venturi
Primary throttle bore: 1-9/16"
Secondary throttle bore: 2"

Motorcraft 4350
The 4300D was replaced by the Motorcraft 4350 carburetor in 1975.
20170313_163540.jpg
 

Attachments

  • FORD MOTORCRAFT D3AF-VA & D4VE-AB MODEL 4300A Big Block Carburetor.jpg
    FORD MOTORCRAFT D3AF-VA & D4VE-AB MODEL 4300A Big Block Carburetor.jpg
    208.9 KB · Views: 0
From what I understand the 71 year model was a transition year with the later year models having the spread bore carburetor do to the change in emissions and the heads. I have closed chambered heads. The CJ engine used open chambered heads. I did purchase a correct dated carburetor from Hemikiller. It’s a 4300-A carburetor. That was the missing link to having a factory carburetor to go with my car. I intend to rebuild my Holley or get another just so I can drive it. I’m not a expert on these cars, only a lover of them. Hemikiller would probably be your best bet for knowledge. Thanks for your reply.
 
The 71 M-code continued to use the square bore 4300A until end of the '71 production year. The May '71-through 1974 Q-codes were equipped with the 4300D spreadbore.
As you read before, I’m rebuilding my Holley. I wanted the Autolite just to complete having the correct carburetor for the car. I’m guessing my Holley is a 4160 from what I read. I plan on getting a rebuild kit soon. Thanks for the correction.
 
As you read before, I’m rebuilding my Holley. I wanted the Autolite just to complete having the correct carburetor for the car. I’m guessing my Holley is a 4160 from what I read. I plan on getting a rebuild kit soon. Thanks for the correction.

Sorry, that reply was meant for rackerm
 

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