Holley 4180C carb repair questions
 

Can I replace the external vent tubes on the bowls of the Holley 4180C carb, or will I need to replace the whole bowl?

If you're talking about what I think you're talking about, the tubes are removable. They just pull out. I don't know if they are available or you would have to get them from another 4180. I am using a 4180 on an older engine, so I don't need the hoses hooked up. I replaced the tubes with little cup plugs for the sake of appearance, it looks better IMO than having the tubes with nothing connected to them. Be careful tapping the little plugs in, so as not to crack the bowls, if you go this route. Hope this helps. :)