Hi Gents,

Here we go, another catch can routing question. Typically air is vented from the valley cover and valve covers to the intake manifold or atmosphere (from my understanding of course with a PVC).

I am starting to plumb this system for the engine in my signature. To make it simple I have been considering running valley cover and both valve covers directly to a atmosphere vented can with no valves. Any reason not to? I have seen diagrams of of dirty/clean sides which confuses me and sides attached to the intake manifold after the MAF; wouldn't that introduce extra air which is not metered?

Can someone chime in?