fords as long as I have being playing with the spanners have had this problem,the newer xx block was a lot worse for going porous, everything from the 3610 up to the tw25's went ,on one occasion while ploughing stopped for lunch on my return started the 25 and noticed she was getting hot ,block gone porous.
The digger below is porous but we filled the rad with oil and every so often we just drain the sump top up the rad and away she goes ,the brother uses it around the yard for mucking out and other small jobs .(bonnet and grill were off to replace the fan belt )
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Most of the John Deere I worked were wet liners and would pin hole if anti freeze/anti corrosion wasn't in place,or the o rings on the liners would perish, saw a Zetor once that got so hot the "O" rings were melted.
Vaguely remember reading a report that it was caused by ultra sound, bubbles formed on the metal of the block and as the bubbles collapsed they eroded the metal,that and defective casting well you know the result ...Some of their car engine also gave similar issues.
I prefer Internationals myself and I haven't had one of them go porous.