I will try a post a picture of my divided head,
it is shaped at the back near the valve pocket. I use the stock post so I have the best clamping force possible.
It does hurt flow about 20% but It increases velocity, mainly puts all the fuel for that port in that cylinder. As stated earlier the velocity is not so great as to hurt VE. High flow numbers are sometimes is not as important as keeping the fuel in suspension.
I feel that working with a stock head is a relative cheap way of trying to improve the performance of the engine, If you want an all out race engine you are wasting money and time just buy a kirby 12 port head, V8 hybrid, or 4 valve and be done.
HARRY
