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Tom, I think you nailed it with your second post. I don't believe there is any change in deck height due to the 2,0 liter head gasket because the "lip" (the cylinder liner) protrudes further than the compressed height of the gasket and it is this surface that seals against the recess in the head. The gasket is sort of a backup.

But that DOES shed light on Porsche's cylinder height testing method-- when they changed the gasket surface the measurement changed but the geometry remains the same.

Now, why one would build a 2,0 on a later mag case except for race purposes. . .

Thanks! Your "library" of Porsche engine parts never fails to impress.