distributor hook-ups

[bobtail]

my distributor has two places for hose hook-ups. one is vac advance . what is the other for?

 

[DirtDonk]

If they're both on the same "can" with one sticking out the front and the other sticking sideways out the rear, or both sticking out sideways from different ends of the can, then yes, as you suspect one is advance and the other retard.
However, unless you have the full plumbing system for running the retard setup (hoses everywhere) then it's not as simply as connecting the hoses to two different places.

If you're just running a simple setup, leave the rear fitting open and connect a vacuum hose to the front fitting.
Usually, with this single hose setup, you connect it to a ported source. So there is no vacuum at idle, and only comes in as you press on the accelerator. Some have found full vacuum to be the ticket, but most of us (probably 85 to 90 percent) have found ported vacuum to be superior for the standard Bronco engine.

Paul

 

[Broncobowsher]

Some years had a weird vacuum retard function for emissions.
If running it as a normal vacuum advance you only want to hook up the advance and leave the retard port open. Don't cap it, it needs to breath so the vacuum side will work correctly.