Answer
2000 to 2002 model years:
7.3l dit v8 navistar
7.2l (3126b) caterpillar inline 6
5.9l cummins inline 6
2003 to current model years:
6.0l dit v8 navistar
7.2l (3126b) caterpillar inline 6
5.9l cummins inline 6
all of the above are diesel engines. a v10 or v12 engine does not exist as an option for the truck in question. hope this helps.