[jhirasak]

Mutt,

Have you solved your transition flat spot problem? If not, I do have a recommendation regarding the emulsion tubes. You stated that you have F5 emulsion tubes in your car. If so, the next emulsion tube to yours that has additional air holes above those in the F5 tubes would be the F3. The addition of 2 holes that are 1 mm in diameter is the only difference between these two emulsion tubes. If you do not have access to a set of F3 emulsion tubes available to you, you could drill two holes in your F5 tubes just above the existing holes to slightly lean out the transition to your main circuit. Figures showing these emulsion tubes can be found in the official Weber Tuning Manual.

In any event, I would still highly recommend that you install a bung in your exhaust to install a wideband Oxygen sensor. I have found this tool to be of a great assistance in jetting Webers.

Regards,

John