Thought about this at lunch: Because of the odd fire sequence, PRV distributor must have an asymetrical cam driving the hall effect sensor (pickup coil). In that respect rotor position is somewhat specific to engine position -- for example rotation between cylinders 1-6 is not interchangeable with rotation between cylinders 6-3. Note however that odd firing pairs would be interchangeable (4-1 6-3 5-2). Distributor positioning is only limited to cylinders 1 and 6 by the hold down method (stud & slot vs clamp) and clearance for the spark advance diaphragm. Note also that the distributor cap is keyed -- it is impossible to misorient it relative to the asymetrical cam. Bill Robertson #5939 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/