Through my past experience in diesel tech courses, I would say that it had a coolant leak at #5 and the water/coolant vaporized and "polished" everything. Although, I'd like to think that the valves and cylinder head would be "polished" as well.
It also appears to me that the head has cracked around the injector bore and between the valves. If that is the case, it's awfully big to be able to see it with the naked eye. Have the head hot tanked and magnafluxed. That will show you where the cracks are, if any(more).
Those UPS and FedEx drivers don't care. They'll start the motors and put the hammer down immediately. For only having 10k miles on it, I'm sure it's been thoroughly abused.
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1990 Dodge D350
Giles' 12mm VE - Airdog II 165 - 370s @ 75lpm - BW S362fmw/68/12 - Hamilton 182/214 - '01 NV5600
Last edited by jimbo486; 09-23-2014 at 06:40 PM.
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