You can crack the secondary blades open a little bit if the engine needs more air at idle. But not nearly as much as you did.
When you have the carb off, you'll see the bottom of the secondary transfer slots is much higher up than with the primaries. You'll also see a small idle ports. They provide small contribution of fuel from the secondaries at idle.
Sorry if the 4th edition has more changes/confusion than I realized.
Don,t feel sorry.There is a lot of info out there that can result confusing.
There a lot of posts of people talking about to use the secondaries to set up the idle speed.
Even Holley,that put that small adjusting screw in a hidden place is now selling a piece or a kit wich makes easier or more confortable to "adjust" the secondaries.
