A- Secondary lockout. Locks the secondary valve C- closed when the engine is cold. Opening the secondary when cold can cause hesitation, or bog. One thing seldom mentioned is that excessive engine wear can occur at high RPM on a cold engine.
This type does not use a secondary lockout as shown above.
To adjust the type of Quadrajet secondary illustrated in the photo.
Open the throttle until the rod touches the lever at A.
Measure the gap between the rod and lever at B.
Adjust by bending the lever at B.