leaking valve covers
 

Any one have a good fix for some leaking valve covers? I have tryed rubber,cork both with and witout rtv.! Help!

Thanks

Might want to give us alittle more detail.What kind of valve covers on what kind of engine?I know years ago those thin aluminum valve cover moroso makes would eventually DEFORM from on/off and you couldn't ever get them to quit leaking.Finally bought a set of solid thick Aluminum Valve Covers,felpro blue rubber with the metal shim in the middle,Studs in the heads and they never leaked.