Yes the crankbolt is torque to yield and should not be reused. I did use my old crankbolt to help draw the new pulley on though, then took it off and put the new one in and torqued it down. You can get a new crankbolt from Ford for about 8 bucks I think.

Formerly known as Sneaku I MISS MY BABY!!! '00 Blk CSVT #1087/2150 built 12/23/99