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Folks,
I think that all of the BMW V12 blocks were made from Alusil.
Alusil is the trademark name of Kolbenschmidt AG in Europe for the process used in their aluminum engine blocks. Alusil basically consists of about 70% aluminum and 30% silicon. Alusil is used to replace Nikasil (a trademark of Mahle) that had corrosion problem with high sulfur content US fuel.
This is the same material that Porsche used in the 928 series engine blocks.
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