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The Dart Pro1-CNC heads are ported and flow tested, and Dart publishes the flow numbers-so why are we flowing our heads? Since each flow bench is a little different, we wanted to get numbers on the APE bench as well. We'll use the information to evaluate our combination once the engine is dyno'd, and as a point of reference for future projects. As it turned out, the Dart ratings were fairly conservative-the heads flowed even more than advertised on APE's bench.