Oil leak at valve covers

[CRUZE 418]

Get a set of aluminum cast valve covers. I use the Felpro rubber/cork. I wouldn't torque them, use a nut driver or old speed handle. I run the bolts down till I feel contact, then just a little more. After one heat cycle, I go back over them and give them just a little more. I have had the same gaskets for 4 years, and have had the covers off multiple times, no leaks.
Steel valve covers, not straight and overtightened, will leak every time. Just don't over do it.

 

[LS&S]

I could not get the Moroso to seal either.. even with aluminum heads and cast valve covers.

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Ended up using these double stack Felpro cork jobbers with a bit of right stuff...

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Discouraging. I'll have to see if I wasted $70 include ship. Ugh!

 

[Johnny Dart]

I installed a new set of cork valve cover gaskets recently and oil residue is visible all around both valve covers, but it isn’t dripping oil out. Are cork gaskets just crap? Should I have put some type of sealant under the gaskets?

Fel-Pro cork is all I use !!!!

I'm going with operator error on this one. To call cork gaskets crap is just silly. People have been using cork gaskets with excellent results for generations.

You can't expect to just slap some gaskets on, tighten them down, and expect them not to leak. There are steps to any gasket when installing, to get them to work properly.