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Mark (not verified)    July 19, 2020 - 2:04PM

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The greatest contribution to reliability Subaru could make would be to integrate the heads into the cylinder assemblies thus removing the troublesome head gasket at the root of so many problems.
This has been done before. The head and cylinder assembly simply bolt onto the crankcase and thus have an unpressurized union to the engine.
Cost would not be greater as they have to make a head and cylinder block anyway and then have very comprehensive bolt configuration to ensure a good seal on the current head gasket plus the attachment of the cylinder block to the crankcase.

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