Before the valves are removed from the cylinder head, what operations need to be completed?

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Before the valves are removed from the cylinder head, all the operations listed (A, B, and C) need to be completed. The cylinder head must be removed from the engine to access the valves. The valve locks (keepers) must be removed to release the valves, and any burrs on the stem of the valves should be removed to prevent damage during removal.

Before the Valves Are Removed from the Cylinder Head, What