Ok we just started up this 350 that we rebuilt. After running it for awhile i just happened to touch the alternator pulley and it was so hot that it burned my hand. Nothing else on the alternator was hot at all, just the pulley, it was actualy sizzling when water hit it. I have no idea what it could be.
also be sure the pulley is in line with the other pulleys...not in front of or behind it. That will cause the belt to rub...and creat lots of heat!! Maybe you put the washer on the wrong side of the bracket or something?