Originally Posted by 4mopower
I just talked to Powermaster the other day about this for my own project, he said make sure it's straight and tight.


^^This^^

My small block has a 5" pulley on the crank and has a Powermaster GM CS121 alternator. I've turned it 7800 and didn't throw the belt. I took a lot of time to ensure everything lined up well when I made the spacer for the crank pulley and the alternator brackets.