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A Callies forged steel crankshaft is used, delivering a 4.000-inch stroke that combines with the 4.125-inch bores to give the engine its 427-inch displacement. It's used with an LSA oil pump, which is a high-volume unit for a conventional wet-sump oiling system, but doesn't require the longer-snout crankshaft of the dry-sump LS9 or LS7. For customers looking to run the factory LS7 dry sump system, Thomson uses the factory crank. View Related Article
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