Carburetor Identification: Notes

Carburetor number Prefix and Suffix (example C6AF BU) is stamped on tag attached to carburetor by one air horn screw. First letter of second line on tag ("A" etc.) indicates design changes which may affect parts replacement. Standard (non-Thermactor) carburetors have aluminum tag.

CHANGES, CAUTIONS, CORRECTIONS 

• 1967 FORD & MERCURY 410" & 428" ENGINE CARBURETOR LOADING AFTER STARTING CORRECTION (Thermactor Engines with Auto. Trans.):  To correct this complaint, install new "BX" automatic choke cover and thermostatic coil assembly, Part No. C7AZ-9848-C (replacing original "BO" assembly), and set carburetor to following new specifications:

  Automatic Choke -  2 Notches Rich.

  Choke Pulldown Clearance -  -140" (9/64).

  Fast Idle Cam Clearance -  .093' (3/32").

  Fast Idle Speed -  1400 RPM.

• 1967 COUGAR, FAIRLANE, MUSTANG 289" ENGINE CARBURETOR LOADING AFTER STARTING CORRECTION (All Auto. Trans. Engines with C7DF-9510-D & C7DF-951C-M Carbs.):  To correct this complaint, install ***new BX" automatic choke cover and thermostatic coil assembly, Part No. C7AZ-9848-C (replacing original "CO" or "BO" assembly), and set carburetor to following new specifications:

  Automatic Choke -  Set at Index.

  Choke Pulldown Clearance -  .109" (7/64").

  Fast Idle Cam Clearance -  .080" (5/64").

  Fast Idle Speed -  1350 RPM.

• 1967 FORD MOTOR CO. 4-BARREL MODEL 4300 CARBURETOR MODIFICATIONS FOR IMPROVED ENGINE PERFORMANCE (289", 410", & 428" V8 Engines except Police Interceptor):  Modify carburetor and make adjustments to correct specific troubles as detailed below.