[s-cars] Repair of a Cracked AAN Head (?)

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The head can be repaired. Small cracks can go without repair. Larger cracks can be welded. To avoid any suspicion of crack migration, the valve seat will have to be pulled to see if the crack goes all the way behind the valve seat. Heat the head to 500 deg F and TIG weld the crack. Grind only the combustion chamber, leave the valve seat insert grinding to the machine shop. I have been told that the specs are in the maintenance manual, but I have never had my eyes on it.