For longevity the 7.3 is **** near bullet proof & they're reputation is very good. The 6.0 WILL make more power & get better mileage with a few serious caveats. Chip it & watch the torque to yield head studs lift like the prom queen's skirt...there's ~$3800 to fix correctly with ARP studs that won't lift.
Spend the $150.00 & get the EGR delete kit, throw the cooler, line & valve in the trash where they belong (as long as you don't live in Cali!). It's about 8hrs of tearing the top end of your motor apart but it isn't hard (the directions are very good).
After that, just keep your oil clean. The 6.0 is still an HPOP system (high pressure oil pump) instead of the common rail found on the Dura-turd, Cummins & newer PSD's. Last March I traded off my '07 6.0 (hence the name Outlaw6.0) for a 2011 6.7 PSD, the 6.0 was great, I did my homework & after 4yrs it had NEVER been in the shop. There are things to look for for sure, but treated correctly, they should last a good while. My father's 2003 has 140k on it & still runs like a top (we did have to replace the oil pressure sending unit).
I would honestly take the 7.3 over the 6.0. The 6.0 will flat out kick the snot out of the 7.3 in a drag race, but that's about the only thing the 6.0 is better at. The 7.3 will last much longer & cause less headache to boot....
I sure wish they still make the Excursion, I wil Love to have one.
BTW. My 6.7 PSD is a year old next month with zero issues. The urea crap is hard to get used to but a minor inconvenience for 400hp & 800lb/ft of torque...almost as much power as my modded out 6.0...lol with a factory warranty... life is good if you're a diesel guy.
smart move me thinks...
