I only have 2 nipples. One on the drvers side valve cover and one on the pass side head.

 

Aren't they in the same place for all LS engines? Drivers side rocker cover, near the firewall. Tube goes to intake, or a catch can preferably.

Edit: Oh wait, you said pvc, maybe you're talking about something other than the positive crankcase vent valve?
Anyway, air comes in thru the passenger side, exits the drivers side rocker cover, valve at the exit.

 

nope PCV sorry. I edited post. On the drivers side there is only a nipple pressed into the valve cover. Could it be under the cover?

 

there isn't a actual valve that you can take out and rattle
its just a metered orifice
so that nipple and tube...is it!

 

ok so I cant put a ford PCV to seal out the boost thanks

 

I would think you could maybe splice into that tube and put a check valve perhaps
are you just hoping to avoid purchasing catch cans?

 

I think what you're calling the nipple is actually the valve, it just pulls out of the cover. The hose slips over the top half of the valve. It's not screwed in or attached mechanically, it just presses into place, in the hole of the cover. They cost like $2.50 at the auto parts store. If you can blow thru both ways, it's broke. It should only allow air to pass 1 way. Side note, I'm not sure how your blower install affects the stock pcv system.

EDIT: Sorry, I was late on the post. I believe my description is the old design.

 

Get a RX catch can that's made for boost. It's way worth it, to protect your Maggie intercooler if nothing else.

 

i orderd a Elite Engineering can.

 

They changed PCV designs around 04 I think...the old style has the actual valve that just slips in, the new style has the nipple made into the cover.