Quik

broken motor lol, it could possibly be the balancer, rev the motor and look at hte balancer if you see it move alot more then the normal% then its a good sign its bad or your crank is wacked.

wildstang87

a small torsional vibration is normal with any V8 with a non 0balance. dont worry about it. if its more than normal chances are its motor mounts, balancer, or the crank lifting, but if the crank was lifting enough youre motor would sound like a diesel running.

88Interceptor

that's what it sounds like to me too!!!
my car was doing it and that was the problem!