The baffled grommet helped me somewhat, but oil still got around the grommet itself. Summit also has breathers with a PCV valve built into it if you want a cleaner look, but the PCV pushes into it with yet another grommet, which caused even more leaks for me.
I bought the tall aluminum valve covers from Summit. Exactly the same as the Ford ones and it included screw-on baffles. My friend bought the Ford ones for $80 more and the only difference was the Ford script. The baffles and the packaging for them were even identical.
Now I'm using a PCV valve on one side, and a closed-system breather on the other side, both on the firewall side of the valve covers. I then drilled another hole in the front for a K&N "breather". The trick, though, is that the grommet holding the K&N breather on is molded shut. It's one of those "cut your own hole" grommets, but I didn't cut it open. To add engine oil I pull the K&N and grommet out. The hole is a 1" hole and opened up with the Dremel until the breather and grommet fit super tight. No leaks, and it looks good! The breather has a deep neck so it stays put. I had an aftermarket "710" cap that didn't go very deep, and it got lost while I was driving.
