I am not satisfied with my own methods for creating a bifurcated inlet port in a cylinder head (or other duct).  I start with three surfaces..the two ports and a bifurcation.  The process is lengthy and involves a lot of 3d sketching, and is also very delicate.

If there is a porting expert out there, I would love to hear advice on good, clean ways to make a realistic port with a smooth bifurcation. 

Thanks in advance.