The gudgeon pin came out unscathed as did the piston crown the piston does rock side to side, haven't had time to take the front one off and check it out to compare it allNew pictures make it look like the piston was rocking sideways on the gudgeon pin, what sort of fit was the pin in the piston and small end (or was it too badly damaged to know)? It looks like it was too slack to me, but van Drenth has had the problem with tight pins, so that's probaly the place to start.
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The only others, repeat, others, have been Omega pistons that have suddenly gone out of shape. That is bigger across the pin, than fore and aft.So what do you think it was Trev', Did the piston just Melt? I have never seen anything like that, Good Luck Bill.