Any reason you couldn't make a "lump sleeve"? Open the runner 1/8. Take a piece of 1 5/8 od aluminum 18 or 20 gage and make a sleeve to fit in the head. You could dimple a lump in the area you want. Maybe put a lip on it so it wouldn't slide all the way in. The intake would press on the lip to hold it. If you had a flow bench you could pull it out and tweak the "lump" till you got the best shape. That make any sense? Z
The problem with the port entry on these heads is that the port is roughly in the middle of the two valves! As the air/gas flow enters the port, it has to split and take an angled path to the right and to the left to even reach each of the valves. The thought of the "lump sleeve" is really a pretty good idea, but I think for it to be able to work at all, the port opening would have to be directly in front of the valve to direct the flow straight at it. As it stands, the sleeve would have to turn the air/gas mixture at roughly a 45 degree angle to the right and left after it passed the port entry wall to direct the mixture a each valve. This would probably make that end of the sleeve much wider than the port opening itself, and impossible to insert into the port. That was a good thought, keep it up....
