Original post by: Matt ,
anything is possible, but is it worth the cost? if both engines have egr, then i think the truck's wiring harness will work on both. i think the motor mounts match up, so the 14l could just drop in. if using 12.7 ecm on 14 l, then reprogramming i would think be necessary. but if 12.7 is pre egr and 14 l is post, then wiring from ecm to truck has to be changed. it costs about 20 hrs labor to change engines if there are no complications. i think i would just put that money and just go to a company like pittsburgh power and have them do their thing on the 12.7.