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Re: leaking valve covers?
Been through this many times. Scrupulously clean valve cover mating surface, ensure they are nice and flat. Lay on generous bead of weatherstripping adhesive aka gorilla snot. Lay high quality gaskets e.g. Felpro on top of the bead of adhesive. Lay covers gasket side down on a flat surface and allow to dry a couple hours. Install, use spreaders and down over tighten. Check tightness once in a while. Never leak again. Gluing the gaskets to the covers is the key.
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