Raid heal a Heroic Raid. And tell your Raid leader, that the Raid wont need a 4th healer, just 3 Healers, you handle the job of the 4th healeŕ becoz healing is too easy. Instead, add 1 more DPSer for the 4th Healer slot. Maybe ask for 5 more DPSers for that 4th Healer slot becoz you are a badazz healer.