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I love this thread and a few others on here and a couple different forums, I learned about the different cams for HP in diesel mechanics 30 years ago and most of the guys playing with diesels today have no clue about what hard parts to change to get better proformance all they know is chips and...

The cam is how almost all old school diesels were bumped up by the factory more than 50 hp in fact if you turned one up without changing the cam it would void the warranty and I know Cat even made hot cams that they wouldn't warranty but did sell for higher hp. No I can't prove all this because...

Did anyone verify the rocker arm difference? And this is just a stab in the dark but the two hole injector might keep temps lower by hitting more surface area of the piston there by cooling quicker?

Okay just read all of this and in three years or more no one has answered the question of what makes the differences. Some have posted parts that are listed as different, and some have cited those parts on both engines. As to rebuilt engines the military does dyno them, there's one at Camp...