vacume question

[achevy1978]

hi
my vac advance off the dist goes to the left front of quadrajet. i pulled it off to check timing
after changing intake gaskets and there seems to be no vacume, engine does not increase in rpm when i take it off... i sprayed carb cleaner around manifold  and no rpm change.

[Boone83K10]

vacuum advance is usually on a ported vacuum source, on at least 95% of street engines. Ported vacuum is closed off at idle. That is why RPM didn't change.

[Irish_Alley]

what boon said. also most people on here say to to move it to another port if you can. the ported advance is more for emissions