OM603 diesel head cracking: the #16 vs #22 head

On the older diesel Gs, the OM603 cylinder head is a known failure point: non-turbo ('#16') heads are said not to survive the added heat and stress of a turbo motor and eventually crack. The community remedy is a NEW #22 head still sold by the Classic Center for about $1,500, moving the cam and valves over with new lifters, though a seller argued a healthy factory turbo bottom end showing no symptoms doesn't need pre-emptive work.