I am purchasing the ASrock extreme9/ac Z87 LGA 1150 and I want to use Corsair Vengeance Pro 16gb (2x8gb) ram. The supported list doesn't say it on the list but the Dominator ram is. I've heard as long as the freq and cas lat is the same it will work.
Over 99% of all DDR3 ram will work with your board and those are new so they were not available when they made the QVL list (which is only a snapshot of what is available on the market). Most likely they will work just fine.
Should have no problem with them, the QVLs are pretty worthless anyway, see here: