Current status of centrifugal advance distributors

[alexiskai]

Originally Posted by Jim Brierley

I ran a B dist. years ago, and it ran well but on a dist. machine the cam showed wear, so it didn't fire at 90 degree intervals, and on the one I had, the advance was unlimited, no problem on a flathead because they don't rev very high.

I think you mean the advance was limited. That is one of the drawbacks to the B setup, the other being its fragile design.

It's important with either the A or B distributor to have a cam that's machined correctly. You can run the B distributor with the A-style cam if your engine doesn't rev too high.