Holley 4160 explanation

Hi guys !

i need some explanation on a holley 4160 carb that is on a 1970 monaco 440.
the car was running waell until last week. it run rough, has a crush on acceleration..

we are trying to understand the functionement of the carb. the main quesion is about the vent valve that apears to be related to anything.
Can you explain me the role of this valve and how it works ?

268780865_1270548910091142_1282169091851193998_n.jpg

here the carb ( he is a bi rough to me ) :

270110006_647039886446847_6041988576257119255_n.jpg

and other side : ( can you tell me why...

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Author: Xavi3r