Zenith carburetor identification

Joe K said:
Or possibly an Argentinian copy? There are absolutely PLAIN (no name) carbs that resemble Zeniths, are rough, and were made in Argentina. Joe K
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Yes certainly were foreign variations - KC/Qualcast in UK, Japanese ones and Agentinian, and I'm sure there were others. Came across an Argentinian Zenith 2 last week that had all the vent holes of post June 1930 but with a brass GAV seat, and as you say a rough casting.
 
Maybe I'm missing something here but ....

Standards manual - Revised 2011 - Area 1 - page-13 - "ENGINE-Holey Carburetor Casting CHanges 1028-1931" - has only one entry for "ZENITH" in Raised Letters

-> December 1928 - Type 3.
 
I have a raised "Zenith" and my friend also has one. His has the number 24 upside-down on the back side, and mine has 30 upside down. There is no lettering or number on the rim inside the bowl. The vent is 9/32 inch diameter. I am certain that it was built by Holley because of other characteristics.

I date it as being used in about October of 1928, following a short time when Holleys with no name on them (usually called Plain ones) were being produced.
 
Richard Lorenz said:
I have a raised "Zenith" and my friend also has one. His has the number 24 upside-down on the back side, and mine has 30 upside down. There is no lettering or number on the rim inside the bowl. The vent is 9/32 inch diameter. I am certain that it was built by Holley because of other characteristics.

I date it as being used in about October of 1928, following a short time when Holleys with no name on them (usually called Plain ones) were being produced.
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Single or double venturi on those?

Joe K
 
Maybe it's time I upgrade my judging standards, I have the 1997 revision and obviously they've done some updating that I'm unaware of, thanks for everyone's help

Hey fidleybits could you post a picture of that page you're referring to? Thanks
 
The Holley-made "Zenith" that my friend and I have is a single venturi. The latest Judging Standard section on carburetors has quite a few errors in it.
 
Hello--This carburetor was produced in late 1928 by Holley. Most were recalled and ground off, some have survived. I believe this labeling by Holley is what prompted Ford Motor Company to require all future carbs starting Jan 1 1929 to have Zenith-l bowl marking on Zenith carburetors and Zenith-2 bowl marking on Holley carburetors. If you would like more information on Zenith carb identification, please obtain recent issues of the Model A Ford club of America's bi-monthly publication The Restorer. Best regards, Steve Schmauch
 
According to Steve Pargeter book Restoration Guidelines version 7a, the brass secondary well along with the lower body marking ZENITH, the carb would be a Zenith built between July 1928 to early '29. Re.: page 34.
 
James G. said:
According to Steve Pargeter book Restoration Guidelines version 7a, the brass secondary well along with the lower body marking ZENITH, the carb would be a Zenith built between July 1928 to early '29. Re.: page 34.
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That's the only Model A carb book I have, and I think it's a good book to own.:)
 
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