I was just over on the Wallace Racing calcs and plugged some numbers into the calculator, since I have been told these MW Victors have lazy ports( poor volumetric efficiency) and my Mach Index is .66. Wallace says anything over .50 requires a late intake closing point of 60 to 90* ABDC. My cam has a 61* closing point. Anyone up on this Mach Index stuff? Any truth to it? I could use some schooling on this. Thanks