What breathers for mopar magnum valve covers
A Mopar performance breather on the opposite side.
Filler cap on the pcv side and a plug in the remaining hole.
I used a ford motorcraft grommet set # M-6892F which is a two piece kit but I only used the one piece which has a 3/4" opening for a pcv valve. I found after searching high and low they are the right thickness for the aluminum valve cover and I liked the 3/4" opening to allow a Chevy pcv valve to be used. (Or older mopar 3/4” one). I used a thin application of permeates gray when I put the grommet in and allowed it to set thoroughly to make sure I had a good seal.
A Mopar performance breather on the opposite side.
Filler cap on the pcv side and a plug in the remaining hole.