Small port heads, big port intake. How bad?
I think there is a lot of good opinions on here. I have to agree that what is hurting you most is the fact that the plenum is too big and the runners are to big(volume wise). I think the mismatch in port shape(Or cross sectional area) is the least of your concerns. Even if you reshaped the ports in your heads to match the intake, it would still be too big an intake. IMO you should get a small port intake and a good 600 cfm range 4 barrel that is in proper operating condition and then tuned to your setup. That should net you the best mileage and all around powerband.
x2
I do like the fact that it's causing the roof to be raised at the heads port entrance but..........................
When the air speed gets to slow, fuel drops out.
In other words, you could loose some low end torque.
NOW, with all that said.................you have the manifold, you have port matched one port and marked up another......
Finish up the port matching, install it and get back to us.
I thing you might just have improved the flow of the head by raising the roof entrance.
From my experience/experiment with my 360 head i would say, Don't worry to much about port matching the floor and DON'T port into the floor at all!!!!
Keep doing what your doing with the roof and port divider wall.
And let us know the resonates
P.S. You have pretty good control of the grinder!:tongue8: