Originally Posted by b. rock
They come detuned in the vans....
The E-series now has the same power ratings as the F53/F59 and F450-F750. 7.3L V8 Premium
350 hp @ 3,900 rpm
468 ft-lbs @ 3,900 rpm
They offer an optional "Economy" tune for fleets, but so far, anything I've seen on the lots has the Premium tune.
7.3L V8 Economy
300 hp @ 3,750
425 ft-lbs@ 3,250
The difference between the light-medium (F250/350) numbers and the heavy-duty numbers mostly comes down to the certification method used. Here's a good summary of the previous offerings, but the difference in ratings is still applicable. Ford has stated in other documents that the engine is mechanically the same across calibrations.
That said, operating RPM could be electronically capped for the dyno certified calibrations, in order to meet CO2 emissions limits (which apply to medium and heavy vehicles in lieu of CAFE limits).
FWIW - The 7.3-liter engine in a Super Duty pickup cranks out 430 horsepower at 5,500 rpm with of 475 ft.-lb. at 4,000 rpm. But this is rated under the chassis certification method, which returns higher numbers.