Armond, the problem area is in the bowl...machinists using a serdi or a vgs20 use a bowl hog to cut out the area below the seat.....it is safer to use the grinding method with appropriate stones.....the flow around the valve is not concentric and hand blending of the bowl after grinding will bias the flow towards the exhaust side of the chamber.....I use a 1.875 for the street to keep the velocity up(turned down 1.94)....not competent on pictures but have a head in progress; perhaps I can send pics to someone who can post when done......fats
