OK its the middle of the night, i have no idea why im doing this now but hopefully you guys can help... The underdrive pulleys came with a set of washers... Im wondering if the washers go from the Underdrive pulley to the crank or from the underdrive pulley to the balancer.. It would space the pulley out more changing the belt angle thus causing a squeal.. I know beacause i had it on my old Z.. I forgot though how I put it on to fix it, it was so long ago.. Anyone know for sure?? Im about to put them on the hub to the underdrive..

 

I would think they are the washers that go between the bolt head and the harmonic damper.

 

There is a set for the bolt heads aswell.... Anyway. I got it on though, turns out those washers are optional if you need em.. some people dont.. I cant get the altenator pulley off though.. Im switching from BBK to march, bbk didnt have the over drive pulley..