FWIW...

Blown up engine here: http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=70;t=000610

I did go back with the 2.3" pulley, and did this:
http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=70;t=000658

good luck.