Having repaired many aluminum head engines including diesels, if the tops of the cylinder walls are stained deep blue, brown, or black indicating the cylinders walls were over heated. You can count on the rings being annealed and ruined. Also the head is at least warped and may be cracked. If the tops of the cylinder walls look shiny with hone marks in tact, the head may be worth a trip to the machine shop for pressure testing and checking to see if it is warped. Often the head can be bolted to a large plate and baked in an oven to straighten it if it is warped a few thousandths of an inch. But, if a machine shop that does cylinder head repair will not guarantee their work on that head, you would be best selling the cam shafts along with the other goodies and scrapping the head. Anyone who sells a scrap head as good using PayPal can expect PayPal to go after them. If I were to buy a used cylinder head with out a machine shop that does cylinder head repair checking it first, I would only pay slightly more than the scrap price.
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