Double gasket valve cover?

[Terry]

Anybody tried double gaskets on your valve covers? I have tried multiple sets of covers as well as permatex.

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[adsm08]

Double gasketing almost invariably leads to a leak equal to or worse than no gasket.

I had good luck with a set of rubber gaskets and a generous helping of RTV.

 

[cp2295]

I personally like the mahle gasket. It’s metal with a strip of rubber. Make sure you peen the valve covers, and rtv where the head meets the lower intake manifold.

as Adsm said do not double gasket. Bad idea.


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[RonD]

+1, double valve cover gasket doesn't help

If you have stamped metal valve covers then you need to straighten them before putting them back on.

Over tightening bends the metal so it can no longer seal to any gasket

So tap around the edge to make surface flat again.

You can also use valve cover hold down tabs, once valve cover is flat again.
This spreads out the holding power of each bolt.

I prefer cork gaskets if you won't be taking valve covers off and on, rubber are better for that since they can be reused.
Cork will swell as oil is absorbed on the inside of the gasket, helping it seal better over time, but they can't be reused after they harden up.

Oil collects at the rear and lower edge of the valve covers, engine slant, so good areas to add RTV

Make sure PCV system is working as it should, this creates a negative pressure in the valve cover areas which helps prevent leaks.
Engines produce Blow-by pressure when running, and engine areas are sealed so PCV Valve can do its job, if PCV system isn't working correctly then Blow-by pressure causes valve cover leaks