[Halon]

Yes you are correct that with your 2 valves, you will always have vacuum. But all that 2nd valve is doing is staying closed when your boost gauge is showing a vacuum condition. I'm not saying what you are doing is wrong, I'm simply asking the question as this is different then what I've heard in the past. Having too much vacuum in your crankcase I had understood as being possibly harmful to the motor as it may start causing oil to be pulled away from components. You want vacuum, but not excessive amounts. Both of our setups should act identical while in boost, whether it be mild acceleration, or WOT, both equally battling the "dip stick popping out" issue.

But if you leave out that 2nd valve, you will also still have vacuum during idle or low throttle conditions, but not as much. You will have similar vacuum to what you had stock. Again, what is the advantage of having even more vacuum while at idle or during light acceleration (no boost, constant vacuum). With both setups, you have the same vacuum source wtill, that vacuum source being the Intake Manifold. But in addition to that, if you don't put in that 2nd valve, you will also be drawing in clean air through that port connected to your inake. I didn't quite understand the whole picture right away, but someone once put it in simple terms that made me completely understand.

It was explained that you're not only trying to release pressure build up as efficiently as possible, but you're also trying to ventilate that dirty air out of there as quickly and efficiently as possible, because it's that dirty blow-by air that likes to cause build up on components, and also causes your oil to breakdown quicker. So he gave 3 scenarios to better explain:

Say you are a young teenager smoking in your bedroom. Your mom calls and says she is coming home early. Not wanting her to find out you were smoking, what is the best way to ventilate that room as quickly as possible?

Option 1: Crack a window and let the air go out the window. (Compare this to just running hoses out of your valve cover to the ground to just allow the pressure a way out.)

Option 2: Crack the same window, but hook a fan up that's blowing out that window to help draw air out of room. (Compare this to your 2 valve setup).

Option 3: Do the same as option 2, but also open up the window on the other side of the room, and hook a fan up taking fresh air from outside and blowing it into the room. (Compare that to setup in the picture I made, allowing air to not only escape out the PCV line, but also draw in air through the intake.)

Made perfect sense to me. Based on my research on the subject, my setup will be using only 1 check valve in line with the PCV. Plasic ones can be had for a buck plus shipping from USPlastic.com. I plan on running the brass one from McMaster Carr for $10 plus shipping unless I'm able to find a nice aluminum one.

Again not saying what you are doing is wrong, I'm just simply stating what I've found in my research, and how I'll be doing it. To each their own!