Did I get two lefts or two rights ??

[Dartswinger70]

I drill them out with a hole saw. U can’t run a pcv valve in both covers. U need to have fresh air coming in the opposite side. Kim

makes sense the factory covers had the "breather" in the center... valve covers like the OP has would use a breather cap.

 

[toolmanmike]

Breather cap on one, a solid fill cap on the other and a PCV in the knock out hole. Geez!

 

[jeff alder]

That's the beauty of the design! You can do whatever you want or need. 2 holes, 3 holes, 4 holes and a Partridge in a pear tree...LOL

 

[CRUZE 418]

He doesn't need to drill anything, damn. I have the same exact pair of covers on my Dart. It had 2 twist in breathers when I bought the car. Mancini racing has a grommet kit for a pcv valve, just put the grommet in and pcv valve if that's what you want. Or buy 2 kits for a push breather. This is simple, or buy another brand of valve cover. Make sure that the baffles are in place under the holes.