Jet size on a 390

[1931flathead]

What the jet size on a 390 2bbl

[rotorwrench]

We have to make a lot of assumptions here. The Autolite 2100 was common to them but Holley made 2V carbs as well. Year model and type of vehicle would help a lot. Ford made these engines a long time. Keep in mind there were triple deuce set ups as well.

If you have the little tag then this might help.
https://www.carburetor-blog.com/know...ase/2100-jets/

[1931flathead]

Ok 390 in a 1969 f150 its a 390 +.060 over with a rv camshaft

[craig]

Still need to know what the carb number is

[1931flathead]

No carb number on it its a rebuilt one take your pick

[scicala]

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Originally Posted by 1931flathead

No carb number on it its a rebuilt one take your pick

Are you sure it's not stamped on the side of the left front mounting ear ?

Sal

[1931flathead]

No marking at all

[1931flathead]

No numbers on the jets that are in it

[1931flathead]

1.55 on the butterflys

[rotorwrench]

There were three carbs listed for light trucks in that list I posted. A person need the parts book information to confirm which was used on the 1969 F100 with the 390 FE since there were 302, 360, and 390 V8 engines available I don't have a Ford parts book for the 68 to 72 Ford pickups. The list has the C9TF-A/-J/-K carbs listed. The smaller jets would likely be 302 application but I can't confirm that. The largest jet size is the C9TF-J but the K may be set up for higher altitudes. That's why a person need the original parts manual. It usually indicates things like this. The left front leg of the mounting flange would likely have 9T J on it if it's a C9TF-J. With no ID on it at all then it could be a late replacement or it could be from any number of different Ford 2V applications. The 2100 carb was used a very long time and a lot of different applications.

[KULTULZ]

Unless one has the actual ASSEMBLY TAG, it is a guessing game as to what period and calibration the carb is. Usually a re-builder will remove any ID so as not to confuse anyone trying to rebuild it for a certain application/calibration as a hi-volume rebuild becomes one-fits-all unless rebuilt and returned as the original application..

Not all 2100's are the same. It might well be a 2100D or 2150.

You will have to jet it for the actual installation, that being plug reading or an exhaust gas analyzer.

And pre-1964 carbs take HOLLEY jets.

[scicala]

Maybe just try it the way it is. Good chance it has the original jets, which would get you in the ball park. If lean or rich, then worry about it and increase/decrease the jet size if needed.

Sal

[KULTULZ]

Now, how the hell did we do that Sal ...

(Posting at same exact time)

[KULTULZ]

Just an example for a 1969 F-150 390 F-2 PARTS LIST -

SEE ILL BELOW

There were six OEM carbs and a later four service replacement carbs just for that particular application. Just two CARB PL's are shown -

[1931flathead]

1968 fe 360 carb said c8ty ya said 54 jets

[KULTULZ]

Originally Posted by 1931flathead

No numbers on the jets that are in it

You don't have an off-shore copy do you?

Can you post a photo(s)?

[1931flathead]

I cant not post a picture it will not let me

[1931flathead]

I cant post a picture it will not let me

[scicala]

Originally Posted by KULTULZ

Now, how the hell did we do that Sal ...

(Posting at same exact time)

As far as I know nobody has done it yet. Just my opinion on the carb situation.

Sal

[rotorwrench]

The jpg file is likely to large on bit count. A person can reduce the file size on MS Paint without reducing the aspect ratio. It basically just reduces the pixel count resolution. Some photo files just have way too many mega-bits for this web site to accept them. Ryan notes that in the upload section of the attachments in the Go Advanced posting set up and options.