PNG'S William Rew started the avalanche of tries in the first minute of play.
From then on, it was all one sided traffic as first half tries went to Jordan Tkatchenko, Hensley Peter and Henry Kalua.
PNG went to the break with a 27-0 lead.
The second half only got worse for the Guam team gave away possession through poor ball handling and penalties.
The try scoring fest continued as Stanis Susuve, Tisa Kautu Eugene Tokavai scored more points.
Peter also grabbed his second for the game.