I hadn't driven the SC all weekend so last night I took her for a romp in the country. I have about 1100 miles on the S&S longblock and for all indications it runs great and I am enjoying my Bird again....until I got 1 mile from home. As I said I took her for a quick back country romp...rarely below 90 mph and at times up to 130mph. I heard a strange noise at my last turn home and then the sound of a large part departing. Somehow the crank pulley sheared all the atach bolts off at the head. To make it even more challenging, the bolts are broken in 3 pieces in the BHJ balancer. Sheared at the head then deeper in the balancer its self. Challenges chalenges challenges, all I can say is I am inordinately lucky it was at 20 mph a mile from home not at 130mph and 40 miles from home.