Nothing much can be done to increase HP without also improving/enlarging the exhaust system, and still retain reliability. 1,380°F exhaust temperature is the point at which valve begin to melt if the hot exhaust gas it not quickly evacuated out of the cylinder.
Just visit some of the diesel websites for pickups and begin reading,especially about the Cummin's B series engine, which-FWIW is the only medium-duty diesel engine used in a pickup.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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