Ok I got my cheapo burrs from Amazon today. They are 1/8 shank and like 3in long.. work in the flex shaft grinder just fine...
Got intake 2 ports almost done... pictures don't do them justice as it was getting dark out. Again, only place the burrs don't reach is the valve guide, so I'll use the 6in burrs and pneumatic for that.
I dont know how long the cheapo burrs will last but im sure ill get lots of practice with them on these heads. Between the small burrs and the large burrs I can really shape these things a lot better.