If anyone out there has experienced a sheared distributor gear maybe you can answer this question? Does the rotor now spin freely or does it remain fixed? Since , when I turn my bottom end the rotor doesn't budge it would be good to know what the reaction of a broken distributor shaft to cam would be. I'm thinking that my chain must have somehow came away from the gears and that the rotor isnt turning because there is no connection between the crank and cam. I've also been told that corvette used plastic timing gears and that may be the reason for a chain that usually wouldn't come off to do just that. Any answers?