97 Cobra 39000 milesVortech Supercharged(Smoke coming out of exhaust)...had a performance mechanic check the car out and he said that the valve stem seals were bad...has this happened to anyone else???? i was told it was a common thing on these motors

 

Yah thats kinda out of the norm for a car with that ammount of miles on it. It all depends on the ammount of smoke comming out... Because valve stem seals wouldn't have a large ammount unless it got real real bad. I think there was another post about this problem.