you have a gt.. you need to talk to opelbits as that is his specialty however the valve covers leak near the back of the engine he tells me as unlike the efficant manta the tighten down bolts for the cover on the ornery GT are very hard to get too. This leak causes oil to dribble down the back of the engine and spread making you think that you have a blown seal.
valve cover gasket 5 bucks at advance auto parts..
valve cover gasket 5 bucks at advance auto parts..