As Methos said, it might be the gasket, but it could be leaking around the bolt thread, I've seen that,but is it more of a seep/wetness.
You can try putting a sealer like prematex or simular ( I have used pipe dope)
on the leaking bolt thread.
If it stops, you found the problem, if not no harm done.
I second the thought of not going tighter on the bolts.
You can crack the casting area bolt boss, and or strip the threads and or "pucker" the cover around the bolt head causing a bigger leak.
Best of luck!
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