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I think Lycoming (aircraft engines) would like to see around 350 degrees in cruise conditions with obviously higher permissible at high power settings (T.O. and climb). I think around 500 is the maximum they would like to see.
For what it's worth the old turbocharged Corvair Spyders and Corsas had a cylinder head temperature gauge that topped out at 600 degrees. I think the most I ever saw on one in a Kansas summer and running hard was a little over 400 when running hard. (The oil temperature warning light would come on first.)
I would expect Porsche's air-cooled parameters to be similar to these; no way to tweak physics and materials.
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