This carburetor model is composed of three major subassemblies; the air horn assembly, the main body assembly, and the throttle body assembly. The die cast air horn contains the choke mechanism, the balance tube which vents the float chamber to the carburetor air inlet, and the fuel inlet valve which is operated by the float suspended from the air horn. The die cast main body contains the float chamber, the accelerating pump, the two venturi, and the removable fuel metering parts such as the two main jets, idle tubes, nozzle bars, and the diaphragm type power valve. The cast iron throttle body contains the two throttle plates and idle speed and mixture adjusting screws.

LINKAGES, LEVERS, ETC

Carburetors of this model have various types of levers and linkages, depending on the vehicle in which they are installed. The levers and linkages provide a means of identifying the carburetor used on each installation. The carburetor which is used with all 1934 to 1948 Ford V-8 engines, and the “60” horsepower engine, and with the 1939 to 1948 Mercury V-8 engine has a ball and socket type connection at the throttle lever, hand throttle lever, and choke lever.

At first glance, the linkages and levers on the carburetors used on the 1937 to 1948 Lincolns appear similar to those mentioned above. However, the throttle lever used on model AA-1 carburetors for the Lincoln has an outline different from that of the throttle lever used on the Ford and Mercury installations. The throttle lever for the Lincoln installation is longer, extending upward and out, while the throttle lever on the Ford and Mercury carburetor pejects diagonally out and down.

The carburetor for the 1937 to 1941 Lincoln has the usual three bolt flange, while the carburetor for the 1942 to 1948 Lincoln is the only one in this group with a four bolt flange.

The carburetor for the 1949-50 Ford passenger car has the ball and socket type connection at the throttle lever and a swivel at the end of the choke lever to accommodate the choke control wire used with this installation. A steel bracket and clamp is attached to the carburetor main body to provide a secure fastening for the choke wire cable. No hand throttle lever is used on this carburetor.

Levers and linakes of the carburetor used on the 1949-50 Ford truck are the same as those of the carburetor for the 1949-50 passenger cars. However, this carburetor may be easily identified since it is the only one in this group having a protruding tapered flange encircling the top of the air horn, all others having a straight ribbed air cleaner mounting surface.