Your valve cover is probably leaking in the back from the half moon gasket that is not sealing against the head... Stick your fingers down between the valve cover and the bulkhead and see if you feel any oil... I had that problem and I used clear rtv silicone caulking in the big tube and sealed the complete gasket to both the valve cover and to the head.. It works and many of the race teams use the rtv caulking. It doesn't take much and before I tighten the bolts I look at the half moon in the front of the engine and also feel with my fingers to make sure the half moon at the back is in place... So it is very easy not to have any leaks... Jim

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James A. Harris