"They're going to be pouring through there."
Walters described the performance of his his forwards in game two as "lackadaisical" until Dylan Napa provided them with the go-forward they so desperately needed.
Papalii was switched from the edge to the middle in game two to provide more punch and support to rookie props Napa, Tim Glasby and Jarrod Wallace.
Walters said Papalii's game two effort, in which he ran for just 87m from nine runs, was lacking and they would need more out of him at the decider at Suncorp Stadium.
"Josh Papalii, we haven't seen a lot of him in both Origin games but last year he was probably one of our better Origin forwards," Walters said.
"Josh is another one we're expecting some big things from tomorrow night.
"When the whips get cracking, we want him to be there."