I hate to tell you this but everyone thinks opening up “the punch” is head porting. Wrong!!!! It’s the easiest to see and the easiest to open up but to port you have to straighten the common wall, widen the short-side, raise the roof, shape the short-side, chamber work, proper valve angles, control airspeed at the shortside so air can navigate the turn (if not air shoots the turn and disrupts clean air coming down the backside of the valve).
