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RE: You're correct

The engine link says 5 main bearing crank. That would mean that EACH piston is braced by 2 main bearings. The same way an inline 4 cyl would typically be constructed. Although for 'light' duty, a 3 main bearing configuration might do as well.

As for the T6 in the alloy designation? That's the heat treatment regime. In 6000 series aluminum, which is IIRC a simple silicon (and?) alloy, that brings it up to roughly mild steel tubing standards.
I don't know what alloy they ARE using for the block. But some series of Aluminum ARE excluded since they are NOT heat-treatable. Like 7000 series, for example.

A little TOO much information about Aluminum Alloys and heat treatment.
Too much is never enough


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