Carb question
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Carb question
Okay, quick question, I have a 74 ford f-100, four speed manual trans,4wd, with a 390. everything pretty much stock, my question is I have a two barrel manifold, I want to add a four barrel carb, can I do this with a 4 barrel spacer or anything else out there? I just put a new motor in the thing and I really do not want to lift that damn intake again and put another intake on. If I cannot put a 4 barrel on it, what would be a good 2 barrel I could replace my rebuilt stock carb? 
Elder User
Joined: Mar 2004
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From: Klamath Falls OR
Okay, quick question, I have a 74 ford f-100, four speed manual trans,4wd, with a 390. everything pretty much stock, my question is I have a two barrel manifold, I want to add a four barrel carb, can I do this with a 4 barrel spacer or anything else out there? I just put a new motor in the thing and I really do not want to lift that damn intake again and put another intake on. If I cannot put a 4 barrel on it, what would be a good 2 barrel I could replace my rebuilt stock carb?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
While not the ultimate in upgrades, the adapter with a 4bbl carb DOES work, at least on a 360. It might take a lot of tuning to get it right, and the extra barrels don't do a whole lot, and if it's a vacuum secondary, you may almost never get them to open, but it does improve higher-RPM power over a stock 2bbl.
But then, almost anything is an improvement with a 360... For a 390? You're better off waiting until you have the money to get an aluminum 4bbl manifold - at least it won't be as heavy going on
What do you guys think of a 500CFM 2bbl Holley? Again, not the best overall, but it saves the guy the work of removing that anchor...
But then, almost anything is an improvement with a 360... For a 390? You're better off waiting until you have the money to get an aluminum 4bbl manifold - at least it won't be as heavy going on
What do you guys think of a 500CFM 2bbl Holley? Again, not the best overall, but it saves the guy the work of removing that anchor...
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
While not the ultimate in upgrades, the adapter with a 4bbl carb DOES work, at least on a 360. It might take a lot of tuning to get it right, and the extra barrels don't do a whole lot, and if it's a vacuum secondary, you may almost never get them to open, but it does improve higher-RPM power over a stock 2bbl.
But then, almost anything is an improvement with a 360... For a 390? You're better off waiting until you have the money to get an aluminum 4bbl manifold - at least it won't be as heavy going on
What do you guys think of a 500CFM 2bbl Holley? Again, not the best overall, but it saves the guy the work of removing that anchor...
But then, almost anything is an improvement with a 360... For a 390? You're better off waiting until you have the money to get an aluminum 4bbl manifold - at least it won't be as heavy going on
What do you guys think of a 500CFM 2bbl Holley? Again, not the best overall, but it saves the guy the work of removing that anchor...
If you want performance and better gas mileage......4V intake. If you are a little lazy and dont want to pull the intake. Go with the 500 2V Holley.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
Had a 500 Holley 2V on my 1968 360 in my F250 when I got it. Added duals, no change. Swapped out the 2V intake and carb for a 4V "S" manifold and a Holley 1850 600 CFM carb, a whole new engine.
Senior User
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From: Santa Maria, CA
I have a 4 bbl manifold, is there different variations of manifolds ? if so which one is best?
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Post Fiend
Joined: Mar 2004
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From: Union, Washington
Yes, there are different manifolds, some much better than others. What are the numbers on your manifold?
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Senior User
Joined: Sep 2008
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From: Santa Maria, CA
the numbers are
c5ae9425c
4h15
The manifold came on a 360 that came in my truck, and i know 4bbl's don't come stock with 360s. I plan on putting this manifold on the 390 i put in the truck that has a 2bbl on it.
Thanks for the help.
c5ae9425c
4h15
The manifold came on a 360 that came in my truck, and i know 4bbl's don't come stock with 360s. I plan on putting this manifold on the 390 i put in the truck that has a 2bbl on it.
Thanks for the help.
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
That will work!!! Here is a link for one:
eBay Motors: 1965 Galaxie 352 390 4bb Intake Manifold #C5AE9425C (item 260343137966 end time Jan-13-09 14:34:09 PST)
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Since Ford never offered a 4WD with a 390, the engine's either been swapped or it's a 360.
C5AE-9425-C = C5AZ-9424-D .. 4V Intake Manifold
Fits: 1965/66 Galaxie/LTD 352 // 1965 Galaxie Police Cruiser 390 // 1965 Galaxie/LTD/Thunderbird 390.
C5AE-9425-C = C5AZ-9424-D .. 4V Intake Manifold
Fits: 1965/66 Galaxie/LTD 352 // 1965 Galaxie Police Cruiser 390 // 1965 Galaxie/LTD/Thunderbird 390.
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
That will be the determining factor. BUT in a pinch it will work....JMHO
Senior User
Joined: Sep 2008
Posts: 170
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From: Santa Maria, CA
Should i have any issues running the manifold on a stock 73 390 motor ?
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Stock '73 heads have small ports and a large port manifold is a mismatch the wrong way. Going from small to large is OK. Going from large to small causes major disruptions in the fuel/air mixture where the manifold and port meet. Will it work? Yes. Will it work right? Not really. Better to find an "S" manifold for the later engines.