It looks like the problems with some late 19's and 20's is due to a bad batch or valves.
For anyone looking for one of these don't let it scare you, the whole thing got blown way out of proportion.
Most engine replacements were due to excessive oil consumption, some of them probably didn't even need to be replaced. I get it that engines shouldn't be burning that much oil but i also wonder how those engines were used.
Just make sure you buy the lowest mileage car you can afford and buy the ford extended warranty. You will be good to go and if the engine goes you get a new motor no big deal.
Even some 500's may be having the same issues with the valves.
https://www.mustang6g.com/forums/thr...-broke.138390/