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They are by far the strongest version of the 6.2/6.5 engines. They are also rated at 250HP and 550TQ out of the box, which is much better than any previous version. I'd love to have one for my M1009 at some point.
There is a guy on thedieselpage that put one in a '93 C3500. He had to have an oil pan made to clear, as the P400 oil pan is too big. The P400 is definitely worth the effort though. The steel crank and integral stud girdle makes it much more durable than a reg 6.5 or even Optimizer.
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