Can I tee both valve cover breathers into one line running to a catch can? Would that provide enough airflow/suction to efficiently remove most hydrocarbons? I plan on running the vacuum line from the catch can to the suction side of the turbo. Theoretically this should work. Or should I retain the throttle body vacuum port and run and inline check valve? Any input?

 

fresh air goes from the throttle body port to the passenger valve cover, air is sucked out of the lifter valley (through the bottom of the intake manifold) and then into the intake manifold.

And theres essentially zero vacuum at the intake of the turbo (unless your air filter is clogged). If you don't believe me simply put a vac gauge there and go drive around.

If you're in speed density mode you can ust put a breather filter on the valve cover and leave the rest of the system normal. It'll still suck fresh air in through the breather filter, and vent blowby to the atmosphere when under boost. If this makes an oily mess, run it into a catch can with a breather filter on it.

 

So put one of these into each valve cover, run both the lines into the inlet on the catch can and have a regular breather on the other side of the catch can?

 

You could yes. You might only need to vent one valve cover (my valve covers don't have any ports on the driver side.)

PCV valves don't hold boost back very well at all, so I put a 1/4" NPT brass check valve on the front port of the manifold (vacuum) and ran a line to where the PCV valve goes in the manifold (gutted the PCV valve).

 

I'm running a holley single plane so none of the PCV stuff will work. I'll probably just do a valve on each cover to pull out gasses more evenly.