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Not wanting to mess with the great tip-in the 670 gave us, we only adjusted the primary side of the fuel mixer. The primary jets were 65s, while the secondaries were 68s, showing that the primary circuit was a bit leaner. With that in mind, we went up four jet sizes to 69s, and then slammed the loud pedal down one last time. The result was 199 horsepower and 287 lb-ft of torque.