Probably not too hard to up the RPM and since bottom line HP is a function of Torque x RPM if you raise the RPM and torques not reduced, then YES that equates to more HP. Id look into things like increasing the compression (pistons or head work etc) and then getting a bit more CFM of fuel to her and you could run at the same RPM yet still have more HP.
Trouble on that engine versus a Diesel as Allan talked about is a lot of the HP (Torque x RPM) comes from RPM so when she lugs down and that drops off the HP drops off fairly fast while a Diesel gets more of the HP from Torque so if it drops off the same RPM the HP isnt reduced quite so bad (its torque curve is pretty good even at some RPM reduction). Some would call that good lugging power I reckon which is similar to how the longggggggggg stroke high torque lower relative RPM two cylinder Deeres are likewise good luggers. Those screamin high RPM Ollies have good HP at that fast RPM, but once the RPM drops way off so does HP. Other Diesel advantages the diesel fuel is somewhat less harsh (might call it a bit of a "lubricant") then gas as far as washing protective oil off cylinder walls and rings and when the fuel ignites expanding gas pressure sort of pushes the piston down versus the sudden explosion of the gas engine which drives/shocks it down (Hey thats NOT technically perfect or accurate but sort of how I look at it, Im NO fuel chemist)
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