#14 heads are notorious for cracking. I wouldn't be surprised if it's cracked at worst and warped at minimum. Driving it home is a bad idea. Get it home and start examining the engine to see if it is toast.

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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