Carburetor idle air bleeds

[Jeff Lee]

Originally Posted by jmarkaudio

As delivered the secondary is adjustable with short mixture screws, they must be plugged once in competition. They supply lead plugs, much like the emission carbs had the idle screws plugged off. Not real sure why, it offers no real advantage having 4 corner idle.

That is correct. I wonder what thought process went into "we'll give them this Holley replacement but hinder them by making the secondary mixture screws adjustable just once"
I guess they wanted to make sure your not driving through the pits at a proper a/f mix if you drive different elevation tracks?