In the late 1970's early 1980's, the EPA wanted the carburetor companies to make "tamper-proof" carburetors.
One of the ploys used was large air bleeds.
Since a majority of average motorists never heard of an air bleed, and an even larger majority of those that had heard of one had no method of changing them, the ploy was quite successful.
Of course, professional racers generally have the capability of machining parts, so this was not an issue for racing with these carburetors.
Jerry - that mixture would burn the redness out of your eyeballs.
Jon.
