Everyday I learn
something new about the 'Olds' world. Being a traditional 'bowtie' guy from birth, I was sheltered from this wonderful invention.
I also was smart and bought a factory service manual for 67 Olds. Here is the information from that publication:
"The stator control solenoid is activated from a
switch in the throttle linkage at engine idle which changes the stator blade angle
(pitch)from low to high. It is also energized at 40 degrees and over of carburator opening by a switch in the throttle linkage to change the stator blades from low angle to high angle."
Hope this helps others, it did me.
Dave