2.0 Dizzy Question, Maybe I am just an Idiot Options

[Mblizzard]

Ok 73 2.0 built to a 2056. Currently running points. Checked dwell and set to specs. I was setting the timing and I have a timing light that you can set in the advance.

1st question: Can you use the advance setting on the timing light instead of the 27 at 3500 rpm?

2nd question: My dizzy has 2 vacuum ports. One is advance and one is retard. My throttel body only has one vacumm port for the dizzy. Do I need both hooked up?

3rd Question: Do I have the vacuum line on the correct (advance) side?



4th Question: when I check the timing (just for fun) with the vacuum hose hooked up as shown the timing is not anywhere close to 27 at any rpm. That seems odd.

[Mblizzard]

So we have a couple of differing opinions on the correctness of the vacuum advance hose connection.

After setting the timing and connecting the vacuum hose as shown, the engine speed decreases greatly. Which to me says that port is retarding the timing. When I switch sides, the engine speed increases.

Anyone have a definitive answer as to which side of the dizzy is advance and which is retard?

[type47]

Anyone have a definitive answer as to which side of the dizzy is advance and which is retard?

Well, the workshop manual pg 2.1-1/2 identifies the port "facing away" from the dizzy (in your first pic in this post, it's the one without the hose connected) as the "Vacuum connection for advanced adjustment". The problem to me is it is not 100% clear which port on the throttle body to connect to. Looks to me to be the port before the butterfly plate.