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· Super Moderator
16,928 Posts
My first thought is poor oil pressure.
Next thought is bad lifters.
Buy a good valve cover gasket and then pull the cover. It might be something has come loose and all that is needed is to tighten it back up.
Do you have the stock oil pressure gauge or have you installed a mechanical gauge? What is your oil pressure at idle and at speed?

Good Luck, L.M.
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