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Message: [QUOTE="alwaysdiesel, post: 1409756, member: 14250"] I've been doing research on 6.4s and 6.7s for the last year or so, looking to drop one in an OBS. I'm having a hard time picking the 6.4 because their reputation for being reliable is awful even with work being done. I just finished doing a HPFP and full EGR D***** on my dads truck because the harness shorted and shut the truck down. I had to pull the cab because the up pipe bolts rounded off. It was my first real good experience with a 6.4. Only work on it prior was services, *** D*****, top rad hose update and fixing a plugged heater core. Digging into the truck a little more, it seems like the engineering of the 6.4 isn't super great. It seems there are lot's of areas to improve on to make things simpler and stronger. Overall, the engine itself doesn't seem overly complicated or cluttered, and I think it could work in an OBS engine bay. My biggest concern is that the engines can be lemons no matter what mods are done. I hear advice given all the time to stay away from them (more so than 6.0s) and it makes me wonder. I've learned of the following common issues: *** clogging, EGR coolers cracking, oil dilution, K16 PCV sticking, Lifters failing, pistons cracking, turbo failure and a large ring gap from factory resulting in blowby and oil dilution. In my mind, all of those can be dealt with. The K16 PCV issue would be tough since they seem to be fairly unpredictable and not quick to get at for repair. Other than that, I don't see why an engine can't be built with delipped pistons, fully D***** with solid lifters, single non VGT or Non VGT compounds and not have to worry about the common problems. Is this work just beyond what most average truck owners are willing to do? I need an honest answer and I know some of the most well built 6.4s are on this forum, guys who know all the engine quirks and deal with them enough to say if they are worth it or not. [/QUOTE]