As above, I milled out the fins and put in a grommet for the P.C. valve. I also took the baffles from the stock cover and mounted them in the Offy cover. Before I mounted the baffles, I was getting a lot of oil being sucked into my carb through the P.C. valve. Baffling the front hole where the oil goes in also kept the oil off the top of my Offy cover.
Al