boost and vacuum advance

[latamud]

Hello,
I'm running 9 lbs boost on my 289 with a mechanical(cetrifical) advance distributor. I am going to drop in a 351w and will use a duraspark distro. I can only find duraspark distros with the vacuum plunger attached to it. Can I just plug the vacuum port and depend on the internal mechanical advance mechanism in the duraspark? Even if I ran a vacuum line from the carb to the distro, the boost would keep the vacuum plunger from advancing. Is the mechanical advancement enough to keep the engine in performance?
Thanks,
bart

 

[ForceFed70]

Yes, just don't connect the vacum advance.

With a boosted setup, I would seriously going to a digital ignition system that will allow you to use a BTM (Boost timing master) basically this unit does the opposite of the vacum advace. It retards the timing based on how much boost is applied.

 

[TobyGaff]

Vacuum advance typically only works at the lower end of the rpm range, where you typically will not have a lot of boost. By the time the boost comes in, your centrifigal advance should be kicking in. I would think that you would have enough adjustment in the vacuum advance to tune it to make it run just fine. Although an electronic ignition would be better, I think that you could make this setup work.

 

[latamud]

Thanks guys,
I'm running an MSD BTM with this setup and it will retard at boost.