The pictured Thermo-Quad is an aftermarket Super-Quad, either a 9801S or 9811S. It's not an original Chrysler equipped carburetor. The aftermarket 9000 series Super-Quads were available in four models: 9801, 9811, 9800, and 9810. The 9801 and 9811 have Chrysler linkage. The 9800 and 9810 have GM linkage. The GM linkage can be adapted to Chrysler applications. The 9810 and 9811 have a venturi fuel bowl mounted vacuum signal port for EGR applications, which can be capped if not used.
The following image shows one of my Super-Quads:
View attachment 1716446270
The Chrysler electric choke control was used on all 1973 - 1984 carbureted vehicles that used the electric assist heated divorced choke. The electric choke control adjusts the rate and time of power applied to the choke thermostat. The control allowed quicker warm-up for sooner choke release above 68 degrees Fahrenheit, and slower warm-up below that temperature. After two to three minutes, the control shuts off the power to the choke thermostat heating element. A single stage and dual stage unit was used. Dual stage units have a finer temperature control and have an external resistor mounted. The style of construction changed in 1977.
The electric control is a small module mounted to the intake or head. The four styles of electric control units are listed in the following and shown in the following image:
- Chrysler 3656730, 3698357: 1973-1976 single stage.
- Chrysler 3755750, 3755770: 1974-1976 dual stage.
- Chrysler 4049799: 1977-1984 single stage.
- Chrysler 4049777, 4091034: 1977-1984 dual stage.
View attachment 1716446259
The controller is mounted on the intake manifold on small blocks or on the head on big block and slant six engines. The following image shows one mounted:
View attachment 1716446267
The controller was not used for the aftermarket Super-Quads with the integral electric choke, but it will work with one. I have been using a 1973 vintage control on my 340 with a Super-Quad for over 20 years.
The original style fuel fitting is the same for all 1971- 1984 Chrysler applications. Similarly for International Harvester applications, but the Ford applications differ. The standard fitting for Thermo-Quads installs into the body with 5/8-30 pipe thread using a 3/4" hex. The fuel line attaches using a 5/16-20 inverted flare fitting (1/2-20 thread). An aftermarket similar replacement version is available from Walker as part number 90-43. The fittings are originally installed with a rubber coated aluminum shim gasket. Aftermarket replacements may be a fiber washer.
The following image shows the original fitting:
View attachment 1716446260