All the talk going on in the Nitrogen Pros Only thread put me in mind of this.
Who uses vacuum as a leak test, I mean a good vacuum gauge, not your manifold? Does it really work well enough to not do an overnight nitrogen test?
I'm real old school and think nitrogen is the best way to test. It seems to me that a vacuum test is still a pressure test but your test pressure is only 14.7 psi (at sea level).
Vacuum test is the big thing where I work, and if somebody convinces me I should stop preaching nitrogen testing I'm sure my co-workers would appreciate it.