Thanks for posting.
After watching this video I would guess the root cause is improper camshaft lobe hardening
rather than lifter roller metallurgy
{edit: wrong guess}
but I bet Ford already knows and is so far being silent.
I suspect date of change on part numbers would give owners a clue.
https://www.youtube.com/watch?v=VdODNCV1disMore likely to be a peak RPM related failure
than peak Horsepower.
Chrysler had problems with its first roller lifters
and Deiter Zetsche had to delay the first year of the 5.7 Hemi due to camshaft bearings.
