FCar2000TA

iTrader: (7)

I am reading threads that say yes and no. So..... I just ordered the 12577927 LS6 valley cover and the Norris Motorsports catch can. So....

Do I still need a PCV valve?

Should I be running fresh air from the throttle body to the driver side valve cover along with the passenger side (makes sense to get fresh air on both sides of the motor), or is fresh air only needed on the passenger (stock) side for some weird reason?

Seems to me that the best set up would be a "Y" connector from the throttle body to both valve covers.

FCar2000TA

iTrader: (7)

bump..... anyone know the answer?

Mongoose350

iTrader: (1)

With the LS6 valley cover you can remove all of the factory PCV hoses. Plug the rear ports on the valve covers because you no longer need them. The catch can should have two ports on it. Run a hose from the valley cover to the inlet and the outlet should be routed into the intake like the factory setup. No need for a PCV valve. If the catch can isn't vented, then put a breather on the passenger side valve cover or the oil cap, your choice.

juniorssrollin

iTrader: (1)

Here is my setup I just finished. I also pulled the fittings from passenger side cover and welded the holes shut for a cleaner look

handyandy496

iTrader: (9)

Run the pcv somewhere in the loop. If you don't you will have a manifold full of oil at wot. Your blowby will push its way back through to the intake even if its vented with the can. If blow by can shoot a dipstick right out of the tube.....

Mongoose350

iTrader: (1)

He shouldn't be seeing anywhere near enough pressure for that unless he's running FI of some sort.

handyandy496

iTrader: (9)

brobinson216

iTrader: (11)

Yes it can.

I'm with Andy I'd put a valve between the valley cover and catch can. It will help tremendously.

With the fresh air coming from the T/B to the passenger VC.

Mongoose350

iTrader: (1)

Well I don't even have a catch can and I haven't had a single drop of oil blow through my breather.

Just my experience.

Majestic9C1

iTrader: (19)

I run my LS6 system without any catch can or another pcv valve and its been fine since I installed it.. hardly any oil blowby

FCar2000TA

iTrader: (7)

Anyone know of a benefit from having the driver side valve cover connected to the line from the passenger side to the throttle body? I read somewhere on here that both sides of the motor need fresh air from the throttle body.

lsfanatic

There are two "LS6" valley covers. The #12577927 (was in the CTS-V and GTO) which has the PCV valve built in and #12568002 (C5 LS6) which does not and you will want to run a separate PCV valve.

FCar2000TA

iTrader: (7)

12577927 is the one that I got. Now I just need to find out if there is any benefit to ventilating both valve covers, or just the stock location on the passenger side.

lsfanatic

Everything I have read is that you run the vent line to the passenger valve cover and just run a hose between the two covers on the rear. Or you could y them at the front, it would basically be the same thing.

JD_AMG

Cammed cars can do that some times, depends on the setup of course, but certainly doesn't take FI to blow a dipstick out or to get oil vapor in the intake.

Also FYI you generally don't want to run an open breather along with the PCV system(its either one or the other), you are drawing in unmetered air into the engine (like a vacuum leak). If you want to run a breather make sure it has a 1-way check valve on it, allowing air out of the crank case but not in. Then you need to hook up the hose between the throttle body and the valve cover, that allows metered air (since its after the MAF) into the crank, the intake pulls vacuum out of the crank through the PCV line, otherwise its pulling from that filter on the valve cover (into the crank, then through the PCV line, then into the intake).