This post is similar to the recent one on the 1973 BB transmission controlled spark (TCS) system. The TCS on my 1974 L-48 TH400 has been removed (I have it) but I have recently found an NOS #1997425 solenoid switch, on its way. I have looked through the AIM and at Dr. Rebuild's diagram but it is not clear to me how this is set up. There are three vacuum spouts along with the electrical connection (still intact and tucked away).
It seems that one spout is for the vacuum advance, one for ported vacuum on the carb (driver's front), and one for manifold vacuum (passenger side) on the carb. I have a "new" #7044206 carb. A mix of ported and manifold vacuum confuses me.
Does anyone have a diagram or picture of the setup?
This is the old solenoid.

This is the "new" carb. You can see manifold vacuum near the choke and ported vacuum on the driver's side higher up.
It seems that one spout is for the vacuum advance, one for ported vacuum on the carb (driver's front), and one for manifold vacuum (passenger side) on the carb. I have a "new" #7044206 carb. A mix of ported and manifold vacuum confuses me.
Does anyone have a diagram or picture of the setup?
This is the old solenoid.

This is the "new" carb. You can see manifold vacuum near the choke and ported vacuum on the driver's side higher up.

Comment