Jay that was a great test you did and alot of work swapping around those manifolds. I guess small ports and high flow to each cylinder can beat a larger port manifold in a small range of the rpm scale. Any change you could get a set of 48mm webers on that motor? I would like to see the midrange differents. 58mm on your 510 motor would be a real test. Again thank you for great info. Rick Lake
