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Message: [QUOTE="me2, post: 175909, member: 3825"] There are lots of 6.7s around with stock block and rods making 6-700 HP. I've been watching for failures and they aren't common. I think the 6.7s build better boost at lower RPMs due to more air flow from more displacement. That allows more fuel at lower RPMs and thus stresses things more. It wouldn't take much in EFI-Live to keep the fuel rate down at lower rpms. It would be easier on the transmission too. I'm building a tow pig engine. I'll probably go with a stock fuel system, a single large turbo and tune with EFI Live. I'm shooting for 450HP/900 ftlbs at the flywheel, all day long, which I am sure the 6.7 is more than up for. The OP asked about a 5.9CR which I am sure is no stronger than a 6.7. 12V is another story, but I wouldn't want to run one in my truck. [/QUOTE]

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