That's exactly what I originally had in mind. Now Bergdonk has me questioning the merits but wondering if it may have something to do with the transition of the radius- is a small radius which would have a flatter face that would be 'seen' by the airflow. Coukdnt quite tell in his photo. Unsure. But after Bergdonks comments I now feel a larger transitional radius will work better' even if it means a little port matching/transitioning with the carb body. I am presuming the ports/reliefs for the two air jets -MSJ and PAJ work? Anyway time to have a play. Unfortunately it will still be a little while till I can test a few samples. Thanks for the info. Much appreciated.