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Need help identifying and finding information about my Holley 1920
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Author:  Brothercactus [ Sat Jan 11, 2020 1:40 pm ]
Post subject:  Need help identifying and finding information about my Holley 1920
I recently bought a Holley 1920. It looks like it's in pretty good shape, I'd like to use it. Before I start rebuilding it, and taking the carb off of my car, I'm wondering if this new carb will even fit my car. While going through the new carb I noticed it has an extra vacuum tube fitting than the carburetor on my car. The main barrel of new carb is also smaller than the one I'm using.

My car is a stock '67 valiant 225.

Side of bowl id
12R-4335B
https://imgur.com/gallery/ujiVB3K

Top of bowl
3080
4355
https://imgur.com/gallery/5djyOUW

Is there a resource for looking up Holley carburetors? I was able to find some product lists but nothing for the 1920s
Author:  SlantSixDan [ Sat Jan 11, 2020 3:36 pm ]
Post subject:  Re: Need help identifying and finding information about my Holley 1920
The carb ID number in this case is 4355 (the lower number stamped on the top surface of the carb body). That is a carb for a 1970 225 taxi, 49-state.

"Taxi" means it's extra-small and calibrated extra-lean to maximise fuel economy in taxicab service.
"49-state" means "except California".

The carb will work fine on your '67. The extra vacuum nipple is for a thermostatic air cleaner your '67 doesn't have; just plug that nipple.

Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download.
Author:  Brothercactus [ Sun Jan 12, 2020 8:10 pm ]
Post subject:  Re: Need help identifying and finding information about my Holley 1920
Thanks Dan, you're a wizard.

That's neat that it's a taxi carb. Do you have any experience with these?

If it's meant to run lean, will I notice the car has less power? I noticed the jet is a 49 rather than the 55(?) that is my stock carb.

Is there any way to tell if it's been remanufactured? It's suspiciously clean.
Author:  DusterIdiot [ Sat Jan 18, 2020 10:03 pm ]
Post subject:  Re: Need help identifying and finding information about my Holley 1920
Quote:
I noticed the jet is a 49 rather than the 55(?) that is my stock carb.
Yeah that's too small of a jet for a car... the local speed shop here used to keep #48 and #49 on hand
because the local amusement used them in their Holley's on their old school stationary rides that used
tractor motors... (like the old loop-o-plane)
Author:  SlantSixDan [ Sat Jan 18, 2020 11:06 pm ]
Post subject:  Re: Need help identifying and finding information about my Holley 1920
Quote:
Thanks Dan, you're a wizard.
Naw, I just have these links (Dodge car), (Dodge truck), (Plymouth) on speed dial. ;-)
Quote:
That's neat that it's a taxi carb. Do you have any experience with these?
Yes. Not with your specific carb, but with a 1962 taxi-spec BBS. Same deal: smaller and leaner.
Quote:
If it's meant to run lean, will I notice the car has less power?
Sorta yes no maybe. Too many variables to give a definitive answer. That № 49 jet would definitely be too small on a regular 225-sized carburetor, but this isn't one of those. It's probably still a few sizes smaller than you'd want for best driveability, but try it out with that jet to get a baseline for how it runs and what the spark plugs look like before you try a bigger jet (like maybe a 52 or 53).
Quote:
Is there any way to tell if it's been remanufactured? It's suspiciously clean.
Well, its glossy-smooth surface is a major plus; that means it hasn't been abusively/fatally cleaned by sand/grit/media blasting, which suggests it has not been "remanufactured" as the term usually applies.
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