I'm following the advice of several forum threads and filling the drilled out holes in my Holley NH with a 8-32 stainless set screws for easy future maintenance. Do I need to use caulk to make it vacuum tight, or are screw threads tight enough? If I need caulk, what caulk is safe for carburetor use, but will not defeat the purpose of using set screws? I recall my handy Permatex #2 cleans up with alcohol, so I suspect that's not the answer.
I use a little Permatex thread sealer, come in a small tube and is a white liquid.
Don't understand the infatuation with screws. Nothing wrong with brass plugs as original. No one reading this post will live long enough to need to reclean those passageways...
To each their own!
(Message edited by redmodelt on July 11, 2018)