Model A & B

Ford Garage

NOS Zenith Carburetor

Shown below is an NOS Zenith Model B style carburetor made for the Model A.

Ford initially serviced the Model A directly with the same carburetor as used on the Model B (B-9510-A1), and then later with the Marvel Schebler 8-2843 (B-9510-A2), and lastly with the Tillotson Model XF (B-9510-A3).

The carburetor below is actually a Model 124 1/2F carburetor made and sold directly by Zenith for aftermarket replacement on the Model A Ford, not the Model B.

This type of carburetor was sold through independent auto parts stores and garages, not Ford authorized Ford dealers and parts distribution.

Special thanks to Rob Mills for the photos of his NOS carburetor.

This particular carburetor does not have a Ford part number and it is slightly different than the production Model B carburetor.

This carburetor is made for the Model A's gravity fuel system and smaller intake size.

The venturi is a smaller size number 20 compared to the larger Model B size of number 22.

The float valve orifice is a larger number 54 compared to the smaller Model B size of number 44.

The main jet is a smaller number 18 instead of number 19, and the compensator jet is a smaller number 17 instead of a number 18. The Model B used the larger size jets.

Shown below is the Zenith parts book illustration showing the two models, one for Model B's and one especially for Model A's.

These carburetors were the 124-1/2 series.

It is not clear why they are labeled as 1" size, since Ford described them as 1-1/8" size, and the throttle bore actually measures 1-1/4".


More related information on Ford Garage:

  1. Model A & B Zenith Carburetor Jet Sizes & Flow Rates
  2. Model B & 46 Zenith Carburetor Parts Catalog Illustrations
  3. Model B & 46 Zenith Carburetor Assembly Drawings
  4. Model B & 46 Zenith Carburetor Float Details
  5. Model B & 46 Zenith Float Valve Orifice Details
  6. Model B & 46 Zenith Carburetor Power Jet Circuit
  7. Model B & 46 Zenith Carburetor Power Jet Tube
  8. Model B & 46 Zenith Carburetor Power Jet Tube Instructions
  9. Model B & 46 Zenith Carburetor Catalog Data
  10. Model B & 46 Zenith Carburetor Upper Casting Variations
  11. For more Model A & B Zenith carburetor web pages, use the Site Search box at the top or bottom of this web page.

May 2005