Can't ID my no tag 2100

[SNOWMAGEDDON]

Hi
I have what appears to be a late 2100 motorcraft 1.08 venturi carb
I can't precisely ID it because whomever rebuilt it (whenever) didn't put the tag back on
there are definitely a number of numbers and letters
What stands out most is
Motorcraft
a giant raised "13"
1.08
8FGA9 beneath the 1.08
an FA stamp
on the wings of the bolt holes there is an H on one wing a 2 on another and a 3 on a 3rd
any help will be appreciated
Jerry

[GRONK]

Jerry,  Why do you need to identify it?  Unless it's going back on it's intended application, a 2100 1.08 kit is a 2100 1.08 kit.

If you post some pics I can probably tell you everything you need to know about it.

[carnuck]

Just make sure it doesn't have a vacuum line to the powervalve under the front of the carb. That would be a 2150 which needs to be hooked up (vacuum lines) differently to work.

[GRONK]

It's a simple fix for the externally sourced power valves, you can drill them to pull internally, then put on the proper cover or cap the external port.

[carnuck]

It's a simple fix for the externally sourced power valves, you can drill them to pull internally, them put on the proper cover or cap the external port.

Not so simple if you didn't know that though. (which I didn't back when I was young)

[doc65]

How about some help with appropriat jet size, got an 85 wagon with the carter still on it, but came with a 2100 that has the likage adapter etc. But the guy I got the car from said he thought it was intended for a 258 CJ, AND the car came from VA to UT so I'm guessing the jet size may be wrong, anyway, the Alt. here is about 4500 MSL

[GRONK]

1.08 Motorcraft/Autolite 2100 gets #46 Jets at 4500' elevation.  I recommend TFI/HEI distributor and you will set your timing at 12-13deg.

Did that help?

[doc65]

It does, I'll have to check what jets it has in it, interestingly it looks a lot like one of your, at least based on the bracketry.  Which is best TFI/HEI.  I like the less wires on the HEI I think, really wish there was a small cap HEI option...

Doc

[carnuck]

If you want small cap HEI, go with a '77 Chev Nova 250 6 cyl with external coil.

[doc65]

Gronk,

Interestingly I have one 45 & one 46 jet in it right now... Any thoughts???

Thanks,

Doc

[GRONK]

1 #45 and 1 #46 you are still good to go.  I was about to write 1 #45 and 1#46 but get tired of explaining why it's OK on a common plenum carburetor/intake to mix jet sizes.  That will allow you to run between 4500-5500' elevation with no issues.

[doc65]

Thanks, I actually realized that it was a common plenum manifold & figured that someone had done a little "fine tuning".  I just meant I found it interesting that the car came with it, and was jetted right for the alt here but came from VA, guess it's possible that the owners that pulled it out here bought the carb after getting here...

I suppose that does mean that if I ever drive it out to visit the Fam. in western OR i'd better take jets & a could screwdrivers as the alt in Eugene is like 350 ft. Or just make sure it's after I do the 4.0/4.6HO FI swap out...

Any thoughts o the other question of which do you recommend, the TFI or HEI, also any thoughts on the other comment about the small cap HEI?  Also what's pricing like on the two (I think) options that you offer?

Doc

[GRONK]

TFI is the better choice IMO unless you are replacing an old points distributor.  The TFI (Duraspark II) ICM is great and will last a very long time.  The cap and rotor are readily available and inexpensive to maintain and it installs in no time.

The HEI is best for replacing the points ignition but is a little more indepth to install.  If I were gonig HEI, I recommend the large cap style as the contact points are spaced further apart.  The small cap HEI has more clearance (not a problem in the 258)

[carnuck]

The mixed jets are often done to compensate for PCV and brake booster vacuum "leaks"

[GRONK]

Not so in this case.  You decrease jet size 1% for every 1000' increase in elevation.  Baseline is #48 at sea level so for every 1000' elevation increase -1% means you go down 1 jet size on 1 jet for 1000'.  Go down 1 jet size on 2 jets for 2000', etc.