not that my two cents is worth too awful much, but i would have to guess that it wouldn't be too far away from the cat small engines, where you get a japanese motor sprayed with yellow paint with a couple of caterpillar stickers smacked haphazardly on the side of it. any other guys like me who are waiting on a 3406e to be shrunk down and stuck into a pickup truck can just keep on waiting, 'cause it's probably not going to happen.... this is just my uneducated opinion.
That's funny our 320c excavator has a mitisubishi motor in it. last time i checked neither cat nor perkins owned mitisu. Another thing you may find interesting we have 3 sullair 185 tow behind compressors with perkins 2.2L turbo diesels that are plagued with problems. we were told they are throw away motors. Maybe that's why there is no core charge on them. Cat uses a couple of different engine builders per the aplication it is to be put in.