I believe Ford made changes in the 3-valve V10 as used in the larger F53 motorhome chassis, but the 2-valve V10 as used on E-Series cutaways (Class Cs) and stripped chassis (Axis and Vegas) have had the same ratings for years.
I just looked up 2014 and compared to 2017, and they are the same:
305 HP at 4,250 RPM
420 lb-ft at 3,250 RPM
Hope this helps.
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