I really don't know. In the F-350's over 10,000 GVW, it's only rated at 316/397, though I am told it is because the ratings are taken at a lower R.P.M. than 6.2L's in lighter Super Duties.

Why is the V-10 still around? Why isn't the 6.2L available in the 450 or 550? Where is the 7.0L Boss?