I had one years ago that was used and in fair to poor shape. Sold it
to a friend that rebuilt it, bought another and ran them for a while.
They were Vaccum Controlled Constant Velocity carburetors. One large
oblong bore, like the old holley three barrel secondaries. The bottom
plate opened for throttle and another was indexed to the vacuum
between the two plates to maintain a constant vacuum. At one time I
had spoken with a man named Dustin (Dusty) Dodge that had worked with
the company. They came out during one of the early gas crisis' and
were supposed to give a noticeable increase in mileage. From what
Dusty told me that had difficulty getting them to pass emissions, but
it was my understanding they did get that figured out. Dusty also told
me that at the same time a Fish carb was being tested and passed
emissions with ease. Fish carbs are still being made as well, with
many changes and improvements over older units made first by Fish,
then Reece Fish, and later Mike Brown.
I'm curious if you're looking at running one of these? I'm guessing
you must have one? I'd certainly be interested in getting one again
if it ever goes up for sale.
thanks