JanT,
When I installed mine I was the butt of endless sarcasm because the slots and drilled rotors were oriented as on Raw Horsepowers'. Further reading showed that the slots and drilled pattern are not as important as the vanes between the two sides of the rotors as diagrammed on my first post. If the vanes are radially oriented no big deal either way. If the vanes are directional the rotor should be positioned so that the heat generated is directed outwards.
Most rotors that I have seen are properly installed as on my diagrams.
Clearly Raw Horsepower's rotors were intended to be installed as he has...as indicated on his instructions. This is the first time I have seen rotors with the venting installed in this direction.
Live and learn!
Eddie