hi, do most the work in the bowls, blend the sharp edges, taper top of guides some.do not gasket match! port match is way better. reason is, if you open up the port at flange, it creates a big bulge in the air flow path. the air has to fill it before it can move on, this causes slowing of the air movement, lose of port velocity! port velocity is what fills the cylinders. anything you can do to raise port velocity is helpful. do not grind out the bowls, keep a venturi shape near the seat area, this helps to speed air back up after going around the corner. which relates to velocity. BTW , this is from super flow, they don't sell heads!! just food for thought.
