I've never seen a 617 blow a head gasket. Unless it saw extreme heat. So are you sure it's the head gasket? Does the car overheat driving? I'm still interested. I drove a car home from Michigan (C36) with a bad head gasket so its not my first rodeo.

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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