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Thinking the engine might need more fuel and air, we installed a Quickfuel QFX 4700 1,050-cfm carburetor and retuned the combo for maximum power. With the larger carb, the engine made its best pull of our session, netting 537.7 lb-ft and 613.3 hp. Even better, the torque and power curves were smooth and broad, indicating that this engine will pull strongly throughout the rpm range. View Related Article
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