There is only one spring and the weights are also different. The one minus the spring has extra material spot welded to it. I tried experimenting with a Volvo B27 that has equal weights with equal springs on each weight. I wanted to get the two distributors compared but finally gave up finding a shop that still has an advance machine so I drove from Minnesota to the Houston open house last summer with the B27 distributor. The engine felt like it had more torque using the B27 distributor and pulled better in all gears from low speeds but it didn't feel like it revved as freely. In the end I re-installed the original DeLorean distributor. Bruce Benson > as an interesting aside, there is only 1 advance weight return spring > - spring stiffness and qty is one of the various spark advance > variables/adjustments, just curious if one spring is typical on the > PRV > > thanks, Cliff > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/