Correct breather for cast aluminum valve covers

CRUZE 418 said

Surprised I guess that there are 2 holes punched in each valve cover, are there baffles under the pcv valve and the cap on the pass side?

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I bought them used on eBay, and that's how they came. In my naivety, I simply didn't question that they had all holes punched out. I will say that once I received them I noticed the hole that the breather is currently in was pretty out of round, and not very well done. That should've been a red flag.

The only baffle is under the PCV valve, all others go straight in. I'm trying to keep the system close to factory - in that the breather, fuel vent, and PCV all go back into the engine. But we'll see what I can come up with. I may just use the boring head on the mill and create a step underneath to reduce the thickness of the boss.

I do like the idea of just the PCV and breather, it's a nice clean look.