[Rick Parker]

My understanding of vacuum is that it uses less initial advance to allow for easier starting (??) and pulls more advance in as timed manifold vaccum increases at cruise. Since most of the engines we utilize SB or BB seem to have a fair amount of camshaft in them, we typically use weak springs in a mechanical advance distributor to allow a faster advance curve. Isn't this just a different way of achieving the same thing by a different means??