While in the final stages of getting the SD ready to run, I cleaned up the underhood environment and eliminated all the vacuum lines to the valve cover.

The attached photo shows all the remaining connections.

The main vacuum supply goes to a single T as seen in the photo. One end of the T goes to the vacuum control valve (via the green dampener) and the remaining end goes off to the transmission. Note the restriction orifice remains in the line to the vacuum control valve.

One T is completely eliminated........the line to the black box on top of the valve cover is eliminated.

The vent line goes directly to the vacuum control valve. One T is completely eliminated. The return vent line to the black box on top of the valve cover is eliminated.

Not shown in the photo is the line from the black box to the temperature switch on the thermostat housing. Remove it and toss it.

Finally, the line from the temperature switch to the EGR valve is eliminated.

As a final farewell, I opened up the black box and pulled out the remains of the 3-2 switches. The IP linkage works a bit smoother when you don't need to force the cam.

Much cleaner underhood environment.

Attached Thumbnails