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It depends on how hot it got and for how long. At this time. a compression test and cylinder leakage test is in order to be able to determine if the problem is valves or rings or leak into the cooling system. If valves are leaking you could have a cracked head. If rings are leaking excessively you could have a damaged piston and or scored cylinder walls if you have air bubbles in the cooling system you may have a blown head gasket or crack in the head or cylinder wall.
If you don't have access to a compression tester and a cylinder leakage tester along with an air compressor to be able to use the cylinder leakage tester then you would have no choice but to pull the cylinder head for inspection...
Keep me posted and let me know if you have any additional questions...