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Hey Mark,
You really don't need the stock crank or want that always. More displacement is always a good thing: faster spool of a bigger turbo :-)
Personally I would limit the stroke at 78mm with type 1 rod journals (55mm) for optimum on stroke and strength.
Head flow and how much boost your engine can take will largely determine the max hp, the size of the engine only how much rpm it takes to get to full boost.
But I am sure you won't grenade the engine after start-up with larger strokes ;-)
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