440 871 supercharger ?

i had the blower on the bench, when i was working on it...i didnt see anything, that was locking it up other than what i said above...its crazy,,, it never really ran, just started and i shut it off to check it over, then tried to restart it, it made an attempt then locked,,,looked like a build up of alum in thoses two little spots

The fact that you say there looked to be a build up of aluminum in those two spots tell me that something got in there, spun with the rotors, scored the casing and then dislodged. Time to check it out real good.

Jack