[MikeK]

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Could you cite the source of this misinformation? Sounds like typical misinterpretation of fact by a writer or reporter devoid of the appropriate technical background.

Common considerations for foundry practice to produce sound castings and subsequent machining would include pattern design of section thickness transitions for directional solidification, ease of sand core production and placement, sprue runner and gate design for laminar flow, type of automated molding production equipment you have, what surfaces will be 'as cast' and which surfaces machined, and the list goes on and on.

There is no migration of 'heavier' iron particles. Density is controlled by directional solidification and rate of cooling. That determines soundness (lack of porosity) and grain size.