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On 21 Mar 2003 at 9:38, Jim Adney wrote: > What you really want is ~30 deg adv going up that hill, but it would be nice to > up that to ~40 once you're at the top and you can let off the throttle and let > the engine relax again. This is what the later (vac/mech adv) dists do, and the > later carbs that were made to work with them had their vacuum ports drilled > differently so they would provide the right vacuum under the right conditions > FOR THOSE DISTRIBUTORS. It occurs to me that the late OE dual carb cars probably have dual advance dists. For this to work, these carbs would have to have different vac port drillings to give the right signals to this later style of dist. Can our UK listees confirm that late dual carb engines came with mech/vac advance dists? Has anyone noticed a difference in the vac drilling in late vs early carbs? Is it possible that Steve has a set of these late carbs? If so, this would really be an ideal setup! It would also be food for thought for Bob, who started this thread. ;-) It makes me wonder if the aftermarket Brazilian Solexs in my 73 might possibly be done this way.... Hmmm.... If so, I might even be interested in keeping them.... -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org