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RE: You're correct

They are using 356 Aluminium which is an alloy for casting. the 4 digit ones are for wrought aluminium.

3xx cast aluminium contains silicon and copper or magnesium.
T6 means it is heat treated and artificially age-hardened.
After casting it is left to cool down and then it is heated to just below the melting point for a set time (an hour or so), quenched and then heated again to a lower temperature and kept at that for some time (quite few hours).

Although no doubt coincidental it is quite apt to use 356 Al for a motor that goes into a Porsche 356 of the same name. ;-)

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