I'm literally made of questions right now. Do you have any details on the truck to share? Is this really out of a 5th gen? Is it not under warranty? Is this a dealer pic or did you take it yourself? Where there any other issues (broken stuff, indicators of this before pulling the head, etc...) with the engine before this was discovered?
Clearly something loose was rattling around in the cylinder not making nice with the other moving bits. What it was, how it got there, how long it was there and where it went are beyond me at this point.
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