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Crank scrapers are good if you take the time to make them up. Crank walk comes from three causes that i know of: block not line bored correctly, clutch apply pressure way to big!, and believe it or not your earth straps from battery to body and engine to body missing or damaged! Causes arcing on the sides of the main bearings when you have a great current draw and the battery is looking for the best earth to supply the other side of the 12Volts.
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