The pair piled on the pain,raising their centuries in the final session on another sorry day for the Windies.
Labuschagne now has three tons from as many innings,while Head went erased the pain of his 99 in the first Test with a ton in front of his adoring home fans.
At 3-330,Australia are poised for a total well in excess of 500 tomorrow.
Their goal will likely be to bat into the final session of the second day so they can take the new pink ball under lights,which is the most treacherous time to bat in day-night Tests.