Whether or not Iran will block the Strait of Hormuz is a hot topic for discussion. There are different types of opinion on this issue. As 20% of the total world oil supply is carried by the Hormuz Strait, the blockage of the strait may push the world oil market in an unsteady condition.
Though Iran has declared that if the western world put embargo on its oil export, the country will block the strait. But for many reasons the action is not easy for Iran. The main reason is that Iran is totally dependent on the ocean route for its most of the exporting goods and without export its economy will fall soon.
To learn about the deep discussion on this topic please visit:
http://www.seanews.com.tr/article/OPINION/75083/Iran-Block-Strait-of-Hormuz/