Buddy of mine has a very nice 66 Chevelle SS. Car had the original motor and trans. He ended up buying a 502 with a roots style supercharger installed off of a guy. He bought a new trans and then installed into his car. Well he got about 300 miles on her and literally drove one of the lobes of the supercharger out the back of the housing breaking the rear plate on the supercharger and destroying the lobe. Come to found out that the motor was in a boat before he bought it. I went over and looked at it and noticed the size of the blower pulleys. I had him call the guy he got it from and asked him at what RPM was he running the boat at. The guy stated he used to run it at 4500 to 5000. Well that answered the question of what happened. My buddy has had this motor up to 6500 rpms a few times and he over revved the supercharger and thats what blew it up. Lesson here, Boat motors are designed for Boats, Not cars. Hopefully none of the supercharger debris hurt the motor. Now he is pulling the motor to check for any internal damage.