This is an article i have found. The engine seems to be substantially updated. The HP and TQ. numbers are different than the ones for the Pick-ups, this write up is for the 2006 Vans. IM assuming the HP and TQ #'s can be manipulated up or down based on the application( vehicle its in). Either way, good article.

http://www.fengshuitours.com/BiodieselBiobased/GMC03042005a.asp

graham

yeah, that was a topic a long time ago that the vans were the new engines, just de-tuned a bit.

here's one.. http://dieselplace.com/forum/showthread.php?t=32782&highlight=van

several more, just search in this section for Van..