When tanking Flamegor measures have to be made, as with the other drakes, to protect against wing buffet and [Shadow Flame]. Onyxia Scale Cloaks were recommended, at least for all warriors before the DoT component of Shadow Flame was removed. Flamegor will enrage a-la Magmadar, which can be removed with [Tranquilizing Shot]. He has a fire effect, Fire Nova , which will do around 550 fire damage to all raid members. This ability is used roughly every five seconds and only when enraged.
The fight is in many ways more simple than Firemaw as the debuff does not stack and therefore tanks do not need to hide to lose debuff stacks. As of patch 1.11, it is no longer possible to avoid the Fire Nova by utilizing line of sight, so it will damage all members of the raid when it is active.
He only does the Fire Nova when enraged, which can be dispelled by Tranquilizing Shot (previously looted from Lucifron). Flamegor will enrage every 10 to 15 seconds, so it is critical that multiple hunters have a well-coordinated Tranquilizing Shot rotation. Otherwise he does no more damage than Ebonroc. Tank him like Firemaw, the enrage debuff can get 1k + dmg on your raid if not dealt with fast enough.
Have a dedicated healer for the off tanks and hunters, they will be taking the most fire and wont have time to care for themselves.