timed or manifold vacuum on a Edelbrock

[1BAD68]

Ok, I just noticed that I have my vacuum advance connected to the manifold vacuum fitting on the carb (drivers side) I read that it should be on the (passenger side) timed or ported fitting.
its a rebuilt 318 with stock distributor, always runs great so I'm wondering if I switch it to the ported/timed fitting will it make any difference?

[Ghoste]

Timed.

[1BAD68]

Timed.

Thanks
but I'm wondering what difference I can expect from it.

[Ghoste]

Tuneability for one.  If you think about having vacuum applied to your advance at idle, why not just turn the dist to that initial setting anyway?
If you do a quick search on the site though, I know it has come up here a bunch of times and guys way way smarter than I'll ever be do a much better job of explaining it.

[Plumcrazy]

If you connect manifold vacuum to the distributor you in effect turn it into a vacuum retard unit.

At idle there will be no mechanical advance but you will have full vacuum advance.  When you accelerate the mechanical advance will start advancing the timing but since manifold vacuum drops, you start losing vacuum advance which cancels out some of the mechanical advance.

Switch the vacuum advance to ported(timed) vacuum and reset the timing.

[1BAD68]

Great
Thank you