Anybody know any good mods to do to the holley 1920 1bbl carb? Like what jetting to mess with and having the throat polished??? or any other mods?
Or does anybody know anybody (trustworthy) to rebuild and or modify my carb?

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Barret-Jackson: Ruining the car hobby for everyone!

Yes, they can be improved.
First you need to make sure you have a good "core".
I completely disassembled my carb, smoothed the venturi,(I think you can make it slightly larger, but I didn't)
The biggest thing I did was modify the fuel bar. Take a look:
http://www.mopar225.blogspot.com
I spent about 4 hours on the bar.
I left the stock jet in it, and the plugs are a light tan color. I may still put a couple sizes bigger in...just to be on the safe side.

I rebuilt the motor at the same time, so I can't say 100% how well it works. But I know it idles very good, starter turns twice to crank it, and it smokes the tires.
I'm happy with it, and I wouldn't expect any more from a 1-bbl engine.
Good luck!
BBBanjo

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225 Cubic Inches of Iron-Head American Muscle

225 bored .040 /.100 off block, Schneider Cam 224@.050~ .480 lift - Stock valves, blended bowls, Offenhauser intake with 500 Edelbrock carb

Yes it can be done, but why would you want to? I did it to my "stock eliminator" carb, because I had to run that carb, per the rules. It was about 3 tenths of a second quicker in the 1/4 mile then a factory stock carb. I think it would be time beter spent, just installing a larger carb.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

My 1920 has a round wagon wheel type spray bar/fuel bar.

As far as mods go, punch the gasket out a little bigger for the accelerator pump shot. Sometimes the gasket will partially block the hole and give you a week squirt.

My carb has a dual plunger set up. I bought new plunger lever arm. My old one was deformed and wasn't actuating the economiser circuit properly.

The third thing was to shim the power valve so it actually touched the lever arm. This can be done by JB Welding a washer on the end of the power valve or by using a thinner gasket on the top or a combination of both.

The last thing was to take the slop out of the accelerator pump linkage. It is in the stock location, but bent to take the sloop out.

Now the carb puts out a healthy pump shot for a real hard take offs and the accelerator pump is immediate.
For a one barrel, it acts more like a highly tuned two barrel or a so-so 4 barrel.
For having a 2.76 Posi and 235/60 14's in the rear , I can break the rear end loose pretty easy.
My carb was pretty much a slug, and a low performer. I am pretty happy with the way it responds and the good gas mileage.
My biggest problem is restraining my driving habits. It is a alot of fun to drive and is very spunky.
So don't give up on the Holley 1920.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

That's an Economaster carburetor, with annular-discharge venturi. These work well for fuel atomisation, though they do tend to limit airflow capacity through the venturi.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

SlantSixDan,

Do you know what years these Holley 1920 carbs were used on SL6's?

Do you know what CFM this style carb is rated at?

What is the CFM of the Carter BBD two barrel?

Is it true that the 2 barrel will provide 10 more HP?

Thanks,

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

[quote="Charrlie_S"]Yes it can be done, but why would you want to? I did it to my "stock eliminator" carb, because I had to run that carb, per the rules. It was about 3 tenths of a second quicker in the 1/4 mile then a factory stock carb. I think it would be time beter spent, just installing a larger carb.[/quote]

Why? Because I can and #2 to weird people out Reason #3 is because the 1bbl intake is already there which means no expense to me, I just dont have lots of $$ even though Id have to agree that my time would be better spent upgrading. But Im scratching my head on this one going why not??

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Barret-Jackson: Ruining the car hobby for everyone!

The Economasters were never original equipment, they were aftermarket only, offered in the late '70s/early '80s as fuel economy replacement carbs.
No.
Don't have hard info on that.
Somewhere in that neighbourhood, yes.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.