So last night with an iLvl of 401 in Prot DPS gear or so I was able to tank all of Temple and Stormstout in as Prot at lvl 85 with next to no problems even while chain and mass pulling. I know these instances are tuned for ilvl of 358, but this still reminds me of all the fun I had tanking old Wrath heroics at 80 with 80% arp in ICC gear as prot.
At what ilevel do you think you will be able to tank MoP introductory heroic 5 mans with all DPS gear? Taking in to account your healer's skill and gear of course.