After speaking while with the gentleman who was selling the CFI unit on eBay he sent me this interesting tidbit of information
I was looking up your information about the spacer that aided the HP at WOT. I donít know if this will help, but I remember working out a problem solution on a CFI unit where the problem was similar, and the reason the CFI units get poor fuel delivery to the outer cylinders is this.
The stock intake manifold's in flow path way is too shallow causing the fuel injector spray pattern to change from spraying an efficient air fuel mix combo to (in a sense) splash the fuel going to the outer cylinders against the sides of the manifold.
One way we were able to really help that from happening was first donít just use a spacer with 2 holes. Instead use an open 1 hole 2 BBL spacer just a spacer with a single large hole, then below that use a standard 2 hole spacer.
This causes a vortex type effect, one big hole being spread up as it goes into the two holes, it atomizes the fuel roughly 40% better than before, and about 60% better if you take your 2 hole spacer, widen the spacers holes gradually from the top of the spacer to the bottom.
Only increase the hole size by 20% and increase the intakes hole size to match the bottom of the spacer, so if the hole size on top of the spacer was 1 inch the bottom of the spacer would look like the hole was gradually getting bigger till the hole reached about 1 1/4 inch.
Then port match the intake hole to the 1.25 inch size. This is what we found to be the best method of getting the most out of the fuel and at WOT you will see at least an extra 27 HP, no doubt about it. It has been a proven method.
Ford created a double wide spacer that acted nearly the same as this method. Without enlarging the spacer and intake holes it still kicks your engine 17 to 20 HP over stock and runs smooth.
In other cars we have seen higher HP and Torque, but in all cases the outcome was a cooler running engine because of the near equal air fuel mix throughout the entire engine's cylinders.
Hope this helps you guys pass it on. Josh Anderson Custom Auto Specialist