http://stiegemeier.com/services/intake-manifold
http://www.svtperformance.com/forums/threads/fully-po0+rted-intake-manifold.11106083/0
Woops didnt post all of the link above
There is one thing wrong with this intake manifold. once modified in this manner, the intake can never be used on a street driven car. Why? Because the bypass system has been eliminated. Without a bypass system the supercharger will not last 10 miles while the car is being driven at part throttle. The bypass system allows air to recirculate across the rotors of the SC to cool them. Essentially it let the air exiting the SC to blow through the intercooler and come back to the inlet of the SC. It is nothing but a big circle of airflow matching the CFM output of the SC versus what the engine isn't using. The SC is a constant air pump. If the engine isn't in boost, yet the SC is spinning fast enough to provide 15 psi of boost for that engine at that moment, the air has to bypass and wrap back into the inlet of the SC. To not allow this to happen causes the SC to run with an airflow deficit, which builds enough heat in the rotors for them to expand to the point of contact. Once the rotors touch each other, the SC needs to be repaired or replaced depending on how bad it is.
The boosted world is fairly new to me. shearing, port wall separation and needing to slow down before the valve all changes under boost? Here is a picture from slawkos site. CNC stuff that is still touched up by hand. The fastest standing mile Ford GT has slawko heads on it est 2500hp. The heads in the picture look pretty smooth, I would guess 220-320 grit finish