What can cause this?
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racerwoman posted the pics in her gallery. It's a cylinder wall and the consensus is that it's some kind of coolant flash. There were no pits/scuff's in the cylinder wall at all or it wouldn't have gone back together. In fact you can still see the cross hatches from the factory hone marks. I have considered sending it to International for a look/see, but it would probably be a waste of time. Besides the carnage created by the oldstyle predator programming on the headgaskets there weren't even any "daisy's" on the tops of the pistons. A testament to Matt's programming.