Autolite Carb
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Junior User
Joined: Feb 2011
Posts: 62
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From: New Glarus, Wi
Autolite Carb
i finally got my new 390 in my 1966 f250 4x4! now there is something wrong with the carb, it seems to running lean! i can only drive it down the road with the choke half to 3/4 closed! i dont know much about the autolite , but i did go thru and cleaned it only to end up with it acting the same! if any of you guys are a guru at these can you give me a little info before i go and buy a new holley? thanks again!
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
i finally got my new 390 in my 1966 f250 4x4! now there is something wrong with the carb, it seems to running lean! i can only drive it down the road with the choke half to 3/4 closed! i dont know much about the autolite , but i did go thru and cleaned it only to end up with it acting the same! if any of you guys are a guru at these can you give me a little info before i go and buy a new holley? thanks again!
One carb kit fits all Auto-Lite/Motorcraft 2V carbs installed in 1962/74 Passenger Cars & Trucks, 1966/74 Bronco's and 1969/74 Econolines.
D4AZ-9A586-A (replaced C2AZ-9A586-B) .. 2V Auto-Lite/Motorcraft Carburetor Kit (Motorcraft CT-499D) / Available from Ford and a gazillion autoparts stores.
-----------------------------------------------------------------------------------------------------------------------------------------------------------
Since the engine's been swapped: If you have a 4V Auto-Lite carb: C2SZ-9A586-D (Motorcraft CT-191A).
Fits: 1962/74 Passenger Car 289/302/351C/351W/352/390/410/428 / Available from autoparts stores. To simply matters, just ask for a carb kit for a 1965/68 Mustang 289 4V
FTE Legend
Joined: Jun 2004
Posts: 31,868
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From: Upstate NY
i finally got my new 390 in my 1966 f250 4x4! now there is something wrong with the carb, it seems to running lean! i can only drive it down the road with the choke half to 3/4 closed! i dont know much about the autolite , but i did go thru and cleaned it only to end up with it acting the same! if any of you guys are a guru at these can you give me a little info before i go and buy a new holley? thanks again!
What do you mean by that, take apart kind of go thru or spray clean the outside?!
Posting Guru
Joined: Dec 2010
Posts: 1,240
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From: Chino Hills
I just ditched my autolite 2B for a Holley 500 cfm 2B, and wow does it run better.
I cleaned, adjusted, and played with the Autolite that never wanted to run just right. Mind you brand new they were not bad, but now with 50 years on the clock the Holley just blows it away. My holley starts up easier, and I have better control of the throttle.
Also most autolites were 350 cfm, and that chokes down small V8's much less a 390. I would do a 4 barrel swap if you have the money. Sometimes you can find holleys 2 barrel cheap on CL, and that would be my second choice.
I cleaned, adjusted, and played with the Autolite that never wanted to run just right. Mind you brand new they were not bad, but now with 50 years on the clock the Holley just blows it away. My holley starts up easier, and I have better control of the throttle.
Also most autolites were 350 cfm, and that chokes down small V8's much less a 390. I would do a 4 barrel swap if you have the money. Sometimes you can find holleys 2 barrel cheap on CL, and that would be my second choice.
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Junior User
Joined: Feb 2011
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From: New Glarus, Wi
it is a 4b and the guy i got it from said it was rebuilt! when i took it apart it had all new floats, seats,gaskets,and etc! thats why i cant figure it out! i have replaced the filter in the cup below the fuel pump and even put a filter on that screws directly in the flaot bowl! i adjusted a/f ratio screws out to 2 turns! i have rebuilt many edelbrocks, holleys, gm quadra-jets, rochesters, and never had this problem, well except maybe with gm quadra-jets lol! i have thought about putting a edelbrock on but thought a holley would look more natural on top of the 390, anyone have an idea what cfm i should look for? thanks for the info!
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Lead Driver
Joined: Dec 2000
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From: South central, Minnesota
I just ditched my autolite 2B for a Holley 500 cfm 2B, and wow does it run better.
I cleaned, adjusted, and played with the Autolite that never wanted to run just right. Mind you brand new they were not bad, but now with 50 years on the clock the Holley just blows it away. My holley starts up easier, and I have better control of the throttle.
Also most autolites were 350 cfm, and that chokes down small V8's much less a 390. I would do a 4 barrel swap if you have the money. Sometimes you can find holleys 2 barrel cheap on CL, and that would be my second choice.
I cleaned, adjusted, and played with the Autolite that never wanted to run just right. Mind you brand new they were not bad, but now with 50 years on the clock the Holley just blows it away. My holley starts up easier, and I have better control of the throttle.
Also most autolites were 350 cfm, and that chokes down small V8's much less a 390. I would do a 4 barrel swap if you have the money. Sometimes you can find holleys 2 barrel cheap on CL, and that would be my second choice.
If he's having to close the choke to run it I doubt the problem is his carb is too small.
it is a 4b and the guy i got it from said it was rebuilt! when i took it apart it had all new floats, seats,gaskets,and etc! thats why i cant figure it out! i have replaced the filter in the cup below the fuel pump and even put a filter on that screws directly in the flaot bowl! i adjusted a/f ratio screws out to 2 turns! i have rebuilt many edelbrocks, holleys, gm quadra-jets, rochesters, and never had this problem, well except maybe with gm quadra-jets lol! i have thought about putting a edelbrock on but thought a holley would look more natural on top of the 390, anyone have an idea what cfm i should look for? thanks for the info!
With the 390 you should be fine with anything from 600-750 cfm. If your motor is basically stock then a 600-650cfm would be good. If it is more of a performance engine then 750cfm would be good.
If you don't want the autolite carb feel free to send it my way.
I like to tinker with the Autolite carbs. If you want to part with it shoot me a PM.
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Junior User
Joined: Feb 2011
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From: New Glarus, Wi
I put a brand new holley 600 cfm 4b on today and damn what a difference! Now it feels like a truly have a big block under the hood! Lol fordman 75 did you still want that autolite?
Lead Driver
Joined: Dec 2000
Posts: 6,293
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From: South central, Minnesota
I'm still interested. But it'll depend on the price. Just shoot me a PM.
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