03 Duramax engine issue
 

Hey guys new on here with an 03 LB7. Parked overnight and something came apart on attempt to crank the next morning but locked up. Not starter, nothing obvious in driver's side valve cover removal. Almost turns one revolution. Sounds metal to metal but fortunate to not be running on that attempt to crank so maybe salvageable. Could sure a break on what to check next. My daughter is on kidney transplant list and I sure
Could use the truck back as soon as I can get it?
If I drop oil pan will I be able to see up in the block well and deregg
http://www.ups.com/WebTracking/proce...ilDate=0111201