Very nice pictures. Looking at your pistons I can still see the machining in the skirts, and thats a good sign. You say that the compression is good, and thats a better sign. That number 4 has some scoring, but you verified compression which is a good indicator of the walls and rings. Its hard to see your rings though from the photo, but that don't sound like it. .010 over on the grind is normal wear and tear and aint going to give you a knock, so I'm guessing not down there either. How do your wrist pins feel at the rod ends or in the pistons themselves? From what I can see, that wear on number 4 is in direct line with the movement and number 4 is wear the torque meets the drivetrain. Its hard to see, but is that bottom ring broke on No. 4 at about 1 o'clock just before it gets to the wrist pin on the right side in the photo? It does look like its missing a piece from what I can see. By the way, the most pressure on the skirts will be 90 degrees from the wrist pins, hence the longer skirt in that area.
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