30mm pumper carb, "dumb question"

[RyanosAlien]

Hey I just bought a 30mm pumper carb and matching I.M and not 100% on the 2nd port on the bottom of the carb that looks like the circle vacuum port on the side of the stock carb, but like i said this is on the bottom and not sure what to hook up there.

[Irish]

"Dumb Question?" There is no such thing as a Dumb Question! The dumbest question is the one that you don't ask. If you don't know , you ask. By the way---"Welcome":shrug::hmm: Irish:scoot::nuts:

[RyanosAlien]

O yea to see a picture it's a pd30j carb