hey guys. new to this forum but an old member of tccoa. i just got a 91 sc from a my friend that he had bought off someone and hasent had time to look at it. he beilives that the harmonic balncer broke or that the crnak has broke right at the fornt of the block. he never really got into tearign it down to see what the problem was so im not sur eyet eithe rbut befor ei get the car to my place i was wondering wehat you guys thoguth was the likely problem