For High Quality Carbide Burrs made in the USA try rjtool.com

Here is a link to their burrs:

RJ Tool & Supply - CARBIDE BURS - Cylindrical, Cylindrical End Cut, Cylindrical Ball Nose, Ball Shape, Egg Shape, Round Nose Tree, Pointed Tree, Flame Shape, 60 Degree Included Angle, 90 Degree Included Angle, 14 Degree Cone Radius End, Pointed Cone,

These are not cheapy imports...

They have the extended shanks too... Great for Head Porting...