Model A

Ford Garage

Zenith Carburetor Numbering

This is a scan from the Ford detail drawing for the carburetor lower casting. This clearly shows the meaning of the Zenith 1, 2, and 3 designations found on the Model A Ford carburetors.

The purpose of the numbers was to identify the manufacturer of the carburetor. The design was by Zenith, but Ford had a close personal relationship with George Holley, and much of the Model A business was initially given to Holley as well as Zenith. Note that the Holley name is mispelled on the Ford drawing!

The purpose of the identification number was for quality and 'warranty' reasons in order that defective parts from dealers could be properly returned and credited. Restorers of carburetors are also aware of the numerous detail differences and supplier markings on many individual pieces which distinguish Zenith, Holley, and Ford carburetor parts.

In 1931 Ford also began producing carburetors themselves in small volumes. The Zenith 3 was identified by much thinner castings and reinforced attaching holes. It was produced in both normal and sidebowl configurations. The non-sidebowl version shown was used on late 1931 Canadian built models which did not ever change over to the indented firewall and sidebowl carburetor.

More Zenith carburetor information on Ford Garage:

  1. Model A Zenith Carburetor Theory of Operation
  2. Model A & B Carburetor Jet Sizes & Flow Rates
  3. Model A Zenith Carburetor A-9545 Secondary Well Variations
  4. Model A Carburetor Float Weights
  5. Model A Zenith Carburetor GAV Wrench
  6. For more Model A & B Zenith carburetor web pages, use the Site Search box at the top or bottom of this web page.

January 2002