You probably could,but most guides only have an OD of about .500, and whether you could create that significant of a change that close to the valve centerline or not, I don't know.Most race heads have a vein that starts about .750"-1.000" away from the valve centerline to give it a little lead-in transition and blending before it gets to the guide. You might take a new guide and stand it up in a vice and use your CAM software to create an ellipse shape around the circumferance of the guide that protrudes thru the roof. This should create less of a frontal area to obstruct the airflow around the guide, and im sure it will help the flow as well to some degree by creating a surface similar to an airplane wing leading edge with less turbulence than just a round obstruction.Something to try....have you tried a G13 for your bowl cutting yet!
