Causes of engine block crack?

Just wanted to get some foresight on potential causes of a cracked block. Tore apart my motor today expecting a cracked head gasket since I was getting coolant in cylinder 3. Couldn’t find anything until I looked at the piston head and realized it’s completely destroyed, and that the blunder wall cracked into the cooling jacket. What could be the cause of this? Thanks FABOView attachment 1716330329View attachment 1716330330View attachment 1716330331View attachment 1716330332
Sorry for your loss on this one, Dano. Hopefully you can have that sleeved to fix if you want to keep it. If not, maybe time to upgrade to a 408 stroker by Blueprint? Can't beat their warranty, and drop in and go. Had a bad engine in my 70 Duster so got the 408 from BPE and never looked back.