Need a vacuum pot for Distributor

[TomoHawk]

MSA tells me you can't get a vacuum pot for a '78 L28 dizzy (Auto trans/Fed spec.) so I need to find a compatible one.

Any suggestions?

Would there be a disadvantage to going with just the mechanical (9 deg) advance? It seems the vac pot can potentially add another 15 or so degrees of advance ...

thx.

[Goose52]

Have you tried your local Nissan dealer? Just 2 months ago I ordered a vacuum advance unit for a '79 distributor from my local dealer and received it in about a week. Perhaps MSA gave the correct answer but a phone call to your dealer might be worth a try to double check. My unit was relatively expensive - about $75.

I don't recall how much advance is provided by the vacuum unit, but the disadvantage of not running the vacuum is some amount gas mileage reduction at part-throttle cruise.

[TomoHawk]

The one I ordered from MSA was coming from the Canadian Nissan parts network, so I would have to assume the U.S. parts network has the same lack of stock on that. That's why I will probably have to settle for a used one, or something close to my oem unit. I would assume the advance curve on the vac pot might be a little different than my oem one.

thx