It may not be the head, these cars do blow head gaskets. My brokers SDL blew its head gasket a few years ago, similer symptoms.

The headgaskets were redesigned a number of times, and much weaker than the heads.

I wouldn't bother doing the oil test, because you know what its going to tell you.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200