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a couple months ago i had to change my manifold gasket on my vortec 350 and i changed my valve cover gaskets at the same time...i had found a website with various torque specs and found the specs for the manifold bolts but i couldnt find anything for the valve covers...anyways i went ahead and just snugged the valve covers nicely and here i am months later and i discovered that my engine head right under the valve cover is oily....is the gasket ruined now or if i re-torqued the bolts to the right amount would it stop the minor leak?