From my dyno sims:
252H 204hp @ 4000 345 lb ft @ 2000
260H 217hp @ 4000 338 lb ft @ 2000
268H 225hp @ 4000 326 lb ft @ 2000
What this is telling me is that peak torque is below 2k. With EFI exhausts, the peak torque of the 268H was a bit higher (2500 rpm, I think). Obviously, the 252H would be best for mpg as long as cruise rpm was geared at or below 2k.
252H 204hp @ 4000 345 lb ft @ 2000
260H 217hp @ 4000 338 lb ft @ 2000
268H 225hp @ 4000 326 lb ft @ 2000
What this is telling me is that peak torque is below 2k. With EFI exhausts, the peak torque of the 268H was a bit higher (2500 rpm, I think). Obviously, the 252H would be best for mpg as long as cruise rpm was geared at or below 2k.