Honestly Hank
I never installed them. But My 2cent personaly Opion is If you divid the Port You should also widen the Port and along with taking at least .100 out of the top which is about half the gasket area in the top of the port.I have not had time to go back and cut the Sides of the Port But
I am pretty sure you can open the port at least .050 If not a little more.With Out having to do any Rewelding Or with getting into the water jacket.
That should get you back some Of the Lost air flow.I have enough cut up heads here ,Im sure i can find out Just How much could be removed. From
the sides Of the Ports.
I just need to get off my butt and find out.
But i feel between the two cuts It should make-up
what was filled in from the divider.
I also feel A shaped divider (meaning Shaped to the top and bottom of the Port would also Help the Air flow around the Valve guide, and down in the short turn radius where the divider meets the floor. Not Flat like That divider was made.
God doesn't like ugly.
