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Engine noise

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I just bought my son a 1988 Oldsmobile delta 88 it runs good and is a high miler.I got it home and there is a horrible noise in the engine like there is marbles in the motor.I can't seem to pin point it but seems louder towards the firewall.I am asking if anyone has had this and how they fixed it. posted by  bigone65

lol there are many different reasons for that sound to happen. it could be lifters collapsing and spun bearings.tear into the motor. for a start check those that i mentioned. if i were u, high milage engine in all, buy a whole rebuild kit for it and overhual the old SOB posted by  DARKtEAGLE

First take off the valve cover and see if you're springs are broken or too loose. You can run the engine without it on, it just might make a mess, but don't run it for too long. That may not be it, but it's where I'd start. posted by  DBain