the power stroke is a option on the larger f series fords. all the way up through the 80's,if a man wanted the maximum power in a class 8 truck,the v8 was the only way to get it right off the dealers lot. in medium duty power levels,what the 5. 9 cummins offers in hp and trq rateings,international offers [7. 3,6. 0] a exact or sometimes slightly higher trq rateing. in medium duty apps dateing back to the mid 90,s ,a person could buy a 5. 9 [12v] with a trq rateing as high as 605 ft,lbs. international offered 7. 3 [t444e] engines with as much as 650 ft,lbs of trq. the newer vrt365 [6. 0] offers trq levels up to 650ft,lbs in international applications also. another thing worth noteing is in both engines max trq is achieved at lower rpms,the 7. 3 peaks 650 lbs at 1500 rpms,the 12v cummins peaked 605 lbs at 1600 rpms. [medium duty rateings]. the 6. 0 in internationl trucks also has a lower rpm trq rateing as compared to its rateings in ford trucks... ...