Quote: in the six pack tuning post it referred to the ports in the venturis. with the engine running use your finger and block off one of the ports and see if the engine picks up rpm or drops rpm, then block the other port and check for the same rpm condition. at this time I don't recall if a increase in rpm meant rich or lean or if a drop in rpm meant rich or lean.
That would be the outer air bleed orifices in each venturi/port of each carb used to help tune the air/fuel mixture screws on each of the 3 carbs (basically the "poormans vacuum gauge"), basic rule of thumb to remember when doing this to help determine the air/fuel ratio is: when blocking one air bleed at a time if it "sounds mean" (idle/RPM increase) "it's lean", "if it's ragged" (decrease in idle) it's rich....so "mean/lean, ragged/rich" easy to remember
