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This is a typical 347ci stroker crank throw, at 1.700 inches. Double the 1.700 inches to 3.400 inches and you have this engine’s stroke. With a 4.030-inch bore, we get 347ci from this cast-steel crankshaft. The difference between a stock 3.000-inch stroke and 3.400 inches isn’t always easy to see, but your engine (and your backside) will feel it in terms of power output.