Quote:
You need to torque each cover bolt to about 740 ft lbs for a firm seal, then spray down the engine compartment with febreze.....
Anyone who posts such a question may not take the above quote for the tongue in cheek one that it is. He has probably already deformed the valve covers beyond repair by trying to stop the leaks by over tightening the bolts.
To answer the original question I would remove the valve covers, clean off all the old gasket and sealant, and try to flatten the flange around where the bolts go through. The mating surface should be as flat as possible. Use a straight edge to check it. Then, if you must, a little Permetex "B" ( non hardening type ) on the surfaces will do. Be sure to use a new gasket. Check the repair manual for the torque required and don't exceed that spec. I have not looked up the correct torque however it should be in inch pounds not foot pounds. If it still leaks the valve cover is still not flat enough or you have over torqued the thing again and deformed the metal. Remember that saying " if a little torque is good then a lot is better" is not a true statement.
BTW I only use sealant on the side of the gasket that faces the valve cover. Mostly to hold the gasket in place wile the cover is installed. This way you can remove the cover without making a mess for serves. If the gasket comes off with the valve cover in one piece you can most likely just reinstall it without leaks.
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