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To re-summarize, the flat six Porsche engine crankshaft is inherently balanced by design. However, this doesn't mean the rotational balance at speed is within specs. Even a round tube can be out of balance, and to assume a flat crank is automatically in balance at operating speeds of 6000-7000 rpm (or beyond) is either too lazy or overly optimistic. An engine builder has many options and paths to putting one together. There are only a few preferred methods, but many more besides that. YMMV.
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