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My 1988 4x2 302 5spd has beeen dripping oil for some time now. I have had the valve cover gaskets replaced and they will not hold(This is my third try). They are not warped. I have tried with only a gasket and also with silicone, but with no luck. While the leak is slow, it is annoying to see spots were you park. Are there any other parts that commonly leak? The intake valley is not leaking.
Get some new rings and seals, overhaul time. Combustion gases are getting to the crankcase.
Before panic sets in, I would suggest researching engine flushes and other additives for cleaning rings and seals, also may want to consider a different weight oil.
the rings may be gummed up and need to be freed-up.
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