wheatfielder
New Member
Any one got advice ref. unleaded in a 3500 1975 with sd1
heads?? Do I need to get one of the in-line lead substitute thingies or change the timing or just use super un-leaded and do nothing else.????
heads?? Do I need to get one of the in-line lead substitute thingies or change the timing or just use super un-leaded and do nothing else.????