itsatdm , the photos I looked at show him making a tank. amazing!
to get 100K out a single big bore ( w/o a rebuild?) may happen but its way outside the norm. also its depends on use, maintence etc....
the engines are similar in design but differ. longevity is probably close to the same,
“I would rather wake up in the middle of nowhere than in any city on earth.” .....Steve McQueen