[patrickt]

Well, maybe not so theoretical. Let's say I have my Holley Vacuum Secondary spring picked perfectly for my engine, but the engine has a restrictive air cleaner. The secondaries open as quickly as possible without the presence of any hesitation or a bog.

I then replace the restrictive air cleaner with a much less restrictive one, so the engine now "breathes" much easier.

How does "breathing easier" affect the venturi vacuum and will the secondaries now open sooner, later, or with no change?