Yep, I know it's a grommet. Do you suppose it's the grommet for a breather or did Mopar have a PCV that was that big. I ask because there is one hole on each valve cover. One is the fill and the other had this grommet. Maybe the guy that had them before me didn't run a PCV.

I'm planning on using a breather that doubles as a fill and will need a PCV valve to go into the other side. I was just wondering if a Mopar ever used a PCV that was this big. Then I would buy that PCV.