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Starting with the exhaust port, the bowl area is blended from just off the valve seat to about 1/2" into the bowl. Try not to make this area too big, the idea is simply to get rid of the sharp edge/transition from the cutting of the new seat by the machine shop. When grinding the short side radius, I begin by grinding straight 90 degrees perpendicular to the exhaust seat, and then rounding the radius over and smoothing it out. This method helps to provide a reference point rather than just randomly grinding and not knowing how much material you've removed.
So far, the only tools I've been utilizing are my air powered die grinder and a 1/2" diameter oval-shaped double cut carbide burr. The shank I'm using is 4" long, which has plenty of length for access to any parts of the ports.
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