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On 25 Jun 2003 at 17:13, timothy kuehn wrote: > So, vacuum issue notwithstanding, I get the impression that ANY 68-71 dist will > give me the same results, so i should get one - ANY one - posthaste.... and then > do the vacuum signal measuring, and see if I can expect any further improvement > from the dual-advance? Do all 68-71 distributors have dual-advance? Or are > there some that do & some that do not? And, say i get one that features dual > advance... am I to understand that there is no harm in running it without the > vacuum module hooked up, if I find that the vac signal from my carbs is of no > use? I think all 68-73 type 3 distributors had vacuum advance and centrifugal advance. Certainly all of the FI distributors did, and that covers the US. In addition, the 72 FI distributor had vacuum retard, and I think the 72 dual carb dist also had vacuum retard, but Dave Hall will have to clarify that. For your application I would advise against one of these "triple advance" dists. The earlier dists have more advance, so I prefer them, My favorite is the 68-9 MT FI "L" dist which has about 28 deg of mech adv plus 10 deg of vacuum adv. You could use any of these without the vac part, but you would lose out on some fuel economy in doing so. As Shad pointed out, you can use the extra advance when you're not operating at full throttle, and this gives you more power and better fuel economy under those conditions. I have good used "L" dists available or I can rebuild one of yours if you prefer. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org