I've been reading a lot on the forum lately to understand the PCV system on the LS2 engine, but I just want to double check my setup.

I appear to have an LS2 Block with a LS6 Intake and 799 heads.
I have the LS2 valley cover with the nipple and LS1 valve covers.

At the moment, the nipple on the LS2 valley cover is connected to the Clean Air nipple on the Throttle body....
The Intake port (after the TB) is connected to the PCV valve and then to the small nipple on the passenger side Valve cover and the larger nipple on the driver side Valve cover.

To me this sounds backwards, I though the clean air should be connected to the valve covers and the LS2 valley to the Intake, but the car runs great ad doesn't suck up oil.

I'm looking at cleaning up the engine and change the Intake, the Fuel rails, the Valve covers and relocate the Coils but I don't wanna mess with the perfectly running engine.

Should I just connect the Intake port to the Valley nipple and optionally insert a Catch Can in between?
If the new Valve covers doesn't have a port for clean air, how do we get clean air in?

Thanks!

 

Also, isn't it redundant to have both the LS2 valley cover and the external PCV valve?

 

this is the way an LS2 or LS6 is routed:

valley cover port on an ls6 or gen iv (LS2) goes to vacuum, either the intake manifold or a port on the throttle body that sees vacuum. There should be a short molded vacuum hose that takes a very sharp turn and goes straight into the intake manifold.

you should not have a pcv valve. that is effectively handled by the black chunk of black and tan plastic bolted to the underside of the valley cover. driver side valve cover should have a small nipple in the back by the firewall with a vacuum cap on it. sounds like you have an older pair of valve covers.

passenger valve cover port goes to the fresh air port on the throttle body, or to a port on the maf tube downstream from the MAF and before the throttle body. As long as the air going through the tube is has been metered by the MAF and is taking air from before the throttle plate.

 

if you did a catch can install, you're basically plumbing it so it is between the valley cover port and the intake manifold.

 

Thanks for the answer, I'll do the change when I receive my new AOS and will plug it right.
The confusing part is that I have an LS2 engine, but an LS1 PCV system/valve covers with the ports at the back of the Passenger Side and Driver side connected together to the intake.
Since I don't have the front port on the passenger valve cover, I guess it's OK to connect that to the fresh metered air?

Also I was reading that there are actually 2 variants of the valley with the barb connector, one with PCV and another one without.
Do you know how the Valley PCV can be tested without removing the valley?

 

the LS2 is a gen iv, and the valley covers for non-AFM/DoD gen iv engines have o-rings to seal off the bosses for the afm/dod lifters, which are not being used. The only non AFM/DoD gen iv valley covers that i know of are the one with the PCV baffle and nipple at the front, and a blank one with no such nipple. If it really is an LS2, then you probably have the valley cover with a PCV.

A gen iii valley cover should have two spots for the knock sensors. A gen iv valley cover will be flat, or have ridges and bumps for the AFM/DoD crap. If you see knock sensor connections, it's not a gen IV motor but probably a gen iii 6.0. Not sure how to verify that one has a pcv baffle without pulling it. But if you don't, you might want to look up the older PCV routing for gen iii's, and then you might want to consider somebody just called a 6.0 an "LS2" because i've heard a number of people say that.

The general rules for routing still apply, though. Fresh air comes from MAF metered, non vacuum. Dirty crank case air sees a vacuum.

 

You might also want to verify if your block is aluminum or iron, lol.

 

Block is aluminum yes... so that's good
I have ordered a new set of valve cover and a catch can so this weekend, I'll tidy up all of this, and route PCV accordingly.
Next step, the intake manifold, this is when I'll find out about the valley cover and the knock sensor I presume.