I know they are arch enemies and there is no love lost between the two of them. The Saudi's are very concerned with Iran's nuclear program. Their single biggest rival within Iran are Shiite's. The Saudi's are very aligned with the west economically especially France. Both Saudi Arabia and Iran have aspiration for Islamic leadership and both countries possess different vision of regional order. In a 1987 public speech Khomeini announced that “these vile and ungodly Wahhabis, are like daggers which have always pierced the heart of the Muslims from the back,” and declared that Mecca was in the hands of “a band of heretics. Like I said...no love lost. Were you looking for something more specific?