LA 340 block crack in deck

Hi everyone, tooke some time but here is a short update: all drain plugs are out and one on each side was a little deeper than the others and that is way it seemed as if it was frozen once which pushed the drain plug out. Nevertheless I will definitely inspect for cracks carefully after I disassembled everything and cleand it up.
Look what I found behind the plugs:
On the left side some really gross mud and on the right side desert sand :wtf:

Foto 08.04.22, 21 03 22.jpg Foto 08.04.22, 21 03 25.jpg Foto 08.04.22, 21 24 50.jpg

So the right sand pretty likely did not see any water for a long time. Going to inspect the heads for warpage.