Valve covers have leaked on several owner cars and there are gaskets for those if that's where the leak is coming from. But most likely, the crankcase breather covers mounted on top of each valve cover is the source of the leak. Just make sure you get the breather covers & mating surface of the valve covers really cleaned of old RTV sealant. Then take extra precaution bolting breather covers on valve covers. Small aluminum screws are a 1x use. Throw the old ones away & replace with new ones.