I put about 36k on mine with the 904, 62k total miles to date.. I just pulled it apart and the pistons, cylinders and bottom end all look great. I have never been nice to it either! The head is another story. It wore out the cam bearing area. I don't think the big bore had anything to do with that.
If you ride it like a normal man should, i think it would easily go as far as a stocker.
