So after replacing the two small pulleys on the Vortech kit because they were making noise, I put the car back together and to my surprise the OEM idler pulley didn't budge as I turned on the car.

I thought I installed it backwards, but after looking at some pictures, I don't think I did. Only thing I can think of is that it is not centered properly. Any ideas?

EDIT: FIXED IT. Had the pilot bearing that goes into the pulley on the wrong side. The pilot bearing goes against the block.