blocks crack behind the liner, a % of the block were on the edge ie cylinder wall thickness, it only takes extra heat from lpg to cause an issue, though not all blocks were on the edge, some failed from new others when cooling system was past best or lpg fitted,some never failed
All seems a bit random!
Still, I guess if it is borderline fecked it might tip it over the edge. But so could a knackered viscous or any number of other things. I like the V8 but it is a bit hit or miss.