Though it sounds like hair if you slow it down, I'm pretty sure the only reason for that is because he trails off the note. You can hear it on "raised the dead" as well. You never hear the "d" in head either. It happens in a lot of other songs as well. Maynard seems to have do it often where he'll trail off a note without really annunciating the last syllable. If you listen to vicarious in "so it is so it's always been" he never really has much if any emphasis on the "n" in been.

Thus I say though it may sound otherwise, I'm pretty sure the lyric is "head"