With only 120,xxx km on it you shouldn't need to do anything to the cylinder head. Most of the wear will be on the exhaust valve faces and guides. All the cylinder heads that I have checked out that I pulled from running engines are beyond a valve lap, 90% of them needing new exhaust valves and guides.
You will be able to see the wear on the valves if present and check valve guide wear by moving the valves side to side all without tearing the cylinder head apart.
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