The Carter used a hot air choke; with a filtered air source at the carb running through a tube to one of the tubes in the manifold. The unit in the manifold is a "U-tube". Then the original had another tube running from the second tube in the manifold to the heat choke on the carburetor.
The manifold unit OFTEN burns out from the raw exhaust that surrounds it, and unplugged, would be an exhaust leak.
PS - the original Carter will perform MUCH better!
Jon.
Good carburetion is fuelish hot air Owner, The Carburetor Shop LLC
