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?

 

The "BEST" thing to do is get a good 4v intake for it! I wouldn't bother with an adapter for it. Kind of wasting your time, in my book! Otherwise leave the 2v on it. JMHO

 

I agree with FORD428CJ.

 

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...

 

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.

 

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.

 

I have a 4 bbl manifold, is there different variations of manifolds ? if so which one is best?

 

Yes, there are different manifolds, some much better than others. What are the numbers on your manifold?

 

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.

 

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)

 

If I remember right a '74 engine is gonna have small ports and the C5 manifold is gonna have large ports. Bad match for air flow and performance.

 

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.

 

Never mentioned what heads he has on it! That will be the determining factor. BUT in a pinch it will work....JMHO

 

Should i have any issues running the manifold on a stock 73 390 motor ?

 

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.