Cork or rubber?

I have the rubber ones.... I have honestly had them on and off about 20 times and the still don't leak.


Leaks are often the valve covers and not the gaskets. If you are using the stock style make sure they have not been over torqued around the bolt holes (you want everything flat). Get some of those "Things" that go under the bolts that spread the pressure away from just the bolt hole.

If you have cast valve covers make sure everything is clean and oil free. I use 3M wax and grease remover (many other things would work just as well). Snug the bolts evenly and don't over tighten.

If you have a valve cover leak..

1. You did something wrong.
2. You have a bent valve cover flange.