<VV> idle vents (was muffler sound)

[UltraMonzaWest at aol.com]

>   Delco Carburetor Training Program 9 Model H-HV says, on Page 4, that
>the idle vent valve (open at idle, as you said) leads from outside the
>carburetor directly into the carburetor bore just above the throttle
plate.
>
>Joe Potts

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Really!   Then how does it stop boilout after a hot shutdown?   I only 
remember a single slot for the idle mix.......in the bore...near the throttle 
plate.....

Matt...perplexed...