could it have been metal fatigue on the crank sprocket? that might have caused it to have side to side movement at which point would definately have caused it to rub. tolerances are very tight...and you had double gaskets....that pulley must have had a LOT of play.
who put it on? did they use proper tools? I would notify Rollmaster and raise a storm. tat could have cost you your engine!!!!
edit: that sprocket could have also been oblong......not fully round. when the crank expands and contracts fom heat...that could have caused it to fatigue....
