Originally Posted by
Mike Rainbird
I would not breath from the top of the cam cover if it was my car. You can use any three-port system, just breath from under the inlet and exhaust manifold and drain to the sump.
Do you use a one way valve for the return to the sump ?
I mean, if you don't have a valve, when the pressure enters the sump, the oil doesn't go out via the return hose ?