 What is the hole under the black knob on the carbureator for?
On my 64 Fairlane with 289, on the passenger side under the black lean knob, is a hole the size of your finger. It points strait down.
If i put my finger up it, the throttle plate closes, so I assume there is a spring or actuator in it.
The problem is, is that it whistles really loud, it sounds just like a belt squealing. It did not do this prior to changing the water pump, so Im not sure what happened. If I put my finger over the hole, the sound quits.
Should there be a plug or a hose on this hole? | 
