[Formulajones]

Originally Posted by i82much

happy with my MSD ready to run. I have one in my GTO and one in a big block chevy. Both were built after the corrosion issues were evidently resolved. Both have digital 6 AL2 boxes and have been flawless. Easy to tune, too, with the bushings and weights.

The only thing I’d like to see them add is a nice adjustable vacuum advance with both the internal hex-adjustable rate mechanism and a total vacuum advance limiter. I think Crane used to make such a part but I haven’t messed with tuning lately so I am not sure.

Crane does still make adjustable cans, and a few others on the market now. Pretty easy to add one on the MSD, they use the standard points style vacuum advance unit.

In fact the original vacuum can that came in the MSD in my chevelle gave up just this year after 25 years of use. I pulled it out to find that MSD had used the popular B28 can in it.
I simply swapped in an adjustable unit from Crane, modified it the way I've mentioned on the forum here in the past.