PVC breathers on valve covers

mr68gts said
My experience..... I ran dual breathers on my 340. It always seeped oil out the breathers. The 416 I am going to build will be getting an evacuation kit to the headers. This way I can use the exhaust scavenging like a pcv system.

but if you run a full exhaust with mufflers you create back pressure back into the engine.