So I have a proper Catch can routing question... I have a Forged H/C LS7 11.25:1, that uses a LS3 topend. I just recently had the car retuned and it was setup on Speed Density. The shop that tuned my car said I a PCV Vac leak because of my catch can / breather setup and having the wrong valley cover "LS6 Version"... So they changed my valley cover to a LS3/7 style and scrapped my catch can/breather. They ended up looping the PCV to intake like oem with a U-hose and drilled 2 holes on my airbridge. They ran a tube from my driver side rear to a hole on the airbridge, and ran a hose from my passenger side front to the other hole on my airbridge.

So, I pulled my TB off yesterday and noticed I had fresh oil puddled on the Throttle body blade opening, Buddy seen this and said they way they did it was wrong and It needs to breath so I dont blow my rear main seal because All I am doing is taking everything and just putting it back through my intake.

So my question is, If I go back and plug the holes on my airbridge, Cap the 2 nipples on my valve covers and scrap those 2 hoses. Pick up a oil cap with a -10 nipple and run that into my breather catch can and hook that up between the PCV and intake. Would this be sufficient or am I going to cause a Leak.

Or should I leave a normal oil cap on, Plug the holes that were drilled into my airbridge and take the 2 hoses from my valve cover and put those into the breather catch can and cap the Intake port and PCV nipple basically eliminating the pcv ...

Any help would be appreciated, I just want to stop the oil, Vent everything properly without having a air leak ect....

Crap pic but this was with the catch/can breather setup before when I had a LS6 valley, Claimed PCV Vac leak



What It Looks Like Now

 

Damn nobody

 

So basically connections are valley cover to intake, post TB

and valve covers to pre-TB, yes?

 

you answered it -Or should I leave a normal oil cap on, Plug the holes that were drilled into my airbridge and take the 2 hoses from my valve cover and put those into the breather catch can and cap the Intake port and PCV nipple basically eliminating the pcv


this is what i have always done on all my turbo cars and what i have seen done on every car making serious power just run -10 lines to a catch can with a breather for the engine to breath and any blowby oil get trapped there and dont make a mess on ur bay, if u have a lot of build up pressure going on u might need a big catch can with multiple breathers

 

valve covers should NOT go to the intake like that. How do they hook up on a C5 normally? Im guessing they hook together somehow and go somewhere(I am not familiar with the C5).

Catch can should go between valley cover and throttle body, no reason NOT to run one.

ETA: Do NOT cap the valley and intake manifold...put your catch can there.

 

In stock trim the passenger side valve cover connects to the same place on the charge tubing as he has it connected now.

 

Exaclty. All its doing is sucking crank case vapors and putting them through the TB and sucking from the PCV back through the intake...

 

That's pretty much the stock setup, looks like he just put bigger hoses from valve cover to pre-TBD so that it can vent there if needed

You can go as simple or crazy as you want with catch cans, etc. honestly.

Are you seeing much oil in your intake now?

I'm running mine the way A&A does theirs.. basically added one way valve to hose from valley cover to post-TB (to stop boost from going into the crank case), then hose from passenger valve cover to air filter. Serves as fresh air in when not in boost, and blowby will vent there while in boost. I haven't had any issues with it. Had MM can setup but started getting smells again so I got rid of it.

I'll sell it cheap if you want it.

 

I wont encounter any issues capping the PCV and inake port and just running both valve covers into a single breather/catch can? Also I shouldnt matter which side of the can each valve cover line goes into correct? The catch can I had on has 2 threaded bungs and a filter on top.

 

You need something sucking fumes out and letting fresh air into the crankcase to keep all the nasty stuff out.

 

What version MM can do you have?

 

It's the version before the current one they are selling today. PCV model

 

Never had any oil before but they said I had a PCV vac leak with the LS-6 Valley and the catch can/breather. With the setup now I had oil in my TB