The engines I modified due to excessive head gasket issues were Mitsubishi 4G63's. Apparently this engine is available turbocharged in some sort of Mitsubishi car & it eats head gaskets in that application. Cometic had a "heavy duty" head gasket which fit perfectly & has been in service ever since. In speaking with them they said they could make a "heavy duty" head gasket for any engine as long as they could have a sample gasket to get the specs from.
They even made a straight 6 head gasket for a Hercules JXLD in an old Clark that I service- Installed it 2 years ago with no issues.
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