Well, with my findings with dividing the entire intake port ,the window gets too small, & when you open up to make up the difference,it's not worth the trouble.
You will get better benefits from a nice large short turn radius than opening up your intake port window size.
Using Larry's bolt in lump port or brazing in a lump port was a better way to go than to divide the entire intake port.
Like I told Larry, when I made upper bolt in lumps, you need to take up some volume towards the back of the port to increase the velosity..& to guide your intake charge in the bowl areas.
Dividing the port , just does not work good for a normally aspirated engine, you need to open up the intake port, then you need to open up/port match the intake manifold ,that will cause you to loose velosity.
MBHD
