you can't tell anything without measuring. It's not the correct way to do it, but if the motor wasn't severely overheated or run low on oil I'd just throw rings on it and put it back. As long as it doesn't have over 350k miles on it otherwise I'd measure it.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k