Quote Originally Posted by 34_40 View Post
It does seem weird! And I don't remember seeing that before. It says in that book it is to help with hot re-starts, you might plug them off and see if it changes anything.?.?.?
I think the explanation is excellent, and it specifically points out that the hot start improvement can be accomplished only with a gasket, or by the drilled holes. Being above the throttle blades the holes cannot affect idle (assuming that your throttle blades are straight and sealing in the bore properly at idle shutoff) and as you come off idle the air flow through the venturi has much less resistance so any trickle of air flow through those holes is negligible. I'd say your problem is somewhere else in that carb.