I nearly forgot. What about Continentals ongoing experiment with little or no Quality Assurance when case hardening their cam lobes and followers.
That coupled with their hit and miss method of seating valves in their new and overhauled io520s and perhaps other models is trashing the company's name.
CASA is asleep at the wheel and some LAMES/ engine reconditioners aren't bothering to report such incidents because past experience has told them they're wasting their time and energy.