Khalaf, the only Arabic village in Khorasan?!

Khorasan was one of the most important regions for the Arabs, the largest Arabic empire originated in Khorasan and we know that some Arab tribes came here especially when al-Mamun, the seventh Abbasid caliph, transfered the capital from Baghdad to this region.

Tomb of Harun ar-Rashid in Tus, Khorasan

But it seems there are already just some Arabic villages in the whole Khorasan and Central Asia and one of them is the Khalaf village:

http://semitistik.uni-hd.de/seeger/english/chorasan_e.htm

The interesing thing is that the people of this village speak still with an ancient Arabic dialect.

large Arab presence?! who is that most people who know you know about, according to what source? better to say the possible large Arab presence in the past thus possible mixture. 

Yeah there was a vast Arab tribal migration to Khorasan, a region which was considerably greater than what is now today, and more importantly the land of Khorsan, during those migrations, already had a clear notable population according even to arab islamic sources, therefore making it impossible for the newcomers to become majority, even on those times in which the opportunists gained upper hand.

Many of them became part of the Baluchis?! and genetic studies approved it the baluchis are the closest to Arabs?! :)) funny ....and the leftover became the pashtuns?! heh could you please name your very-first-hand-if-they-exist sources in here. in order to inform the others of this discoveries?...

What Iranian revolution?

As for the Baluch, well historians don't agree with you. Yaqut when he talks about them, he calls them بلوص says that they claim to be Arabs and that Arabs intermixed with them. I never said that All Baluchs are Arabs, I said they joined in the confederations because of continuous wars and because Baluch and Pashtun were the strongest they became part of them.