Bill, Back in the mid 70s when HEI ignitions first came out, the initial spark plug gaps were 0.060. Some were as high as 0.080. Unfortunately, when the ignition system get wet in the rain, these cars would not start. A service bulletin came our reducing the gap to 0.045. I still use this range on my 70s cars. BOB 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/