Hello,
This is a 08 H2 SUT with 6.2 and 100k mi, rebuilt or not? I dont know, regular maintenance I am sure. Bought it several months ago, i have history on how previous owner treat it. So in the below link to Youtube are the video I record this night on a not that cold start (temp gauge read about 120F right after start), and in the begging there were some strange noise for a few seconds, then disappear, then the engine will keep doing like Kuang~Kuang~Kuang ~Kuang when i stand outside the car and hear it. Please let me know what that sounds is, anything serious? or just normal
Link to video:

 

Kinda sounds like a belt / rotational noise in the beginning to me.

6.2's are also notorious for having valve train noise on start up too.

Tim

 

I can't really hear anything wrong. Check the exhaust manifolds for broken bolts.

 

Fan Bearing?