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The stock crank is forged, because when Ferdinand was designing the engine they found that the cast cranks had the fault of snapping after spirited use. Therefore, since you said you want to use your car for Auto-X, I would stay away from the cast crank and buy a forged. From what I hear, CB Performance now makes 76mm forged cranks for the same cost as a 69mm. So for maximum displacement on a budget that is what I would go with.
fast70
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