I'm also seeing 19" Hg at warm idle.

 

Should have gotten a dyson

 

Quick question...where you are getting your vacuum source from. I've heard of people using a T-adapter on their brake booster line but I've also noticed a small 1/8" manifold port under the "Vortec" engine cover (passenger side of intake manifold). Are there any other good vacuum sources? I'm curious because I want to install a Vacuum gauge on my truck. Thanks.

 

Same here.

 

I don't think an engine could idle w/ zero vacuum? but as soon as I say this someone will prove me wrong.

 

No vac = no brakes.

 

I idle at 19.5 as well, stock cam...