Flanker Dalton Papali'i opened the account, diving over the top of the ruck. Wing Caleb Clarke was a constant menace on the left flanks, while fullback Will Jordan set up two tries with long breaks. Halfback Ere Enari and captain Luke Jacobson operated with quiet efficiency, and then the latter uncorked two tries to cap a fine tournament.
The individual star of the final, however, was Wellington hooker Asafo Aumua, who scored a hat-trick, including one solo try in which he beat no less than six defenders before being subbed at around 65 minutes with what looked to be rib injury.
New Zealand were clinical off turnovers and stretched and then broke the England defence. Even when prop Ezekiel Lindinmuth was binned for a late and high tackle, they did not lose their structures.
Stephen Perofeta played well at first five. His goalkicking was up and down, with seven from 12, but he did just fly in three days before the final.
England captain Zach Mercer summed up New Zealand's dominance.
"I've never witnessed a team that just keeps coming like that with that spirit."
New Zealand head coach Craig Philpott was rapt.
"It's pretty exciting. It's not every day you get to say you are world champion," says the Hawke's Bay coach.
New Zealand Under 20s 64 (Asafo Aumua 3, Luke Jacobson 2, Dalton Papali'i, Pouri Rakete-Stones, Isaia Walker-Leawere, Josh McKay, Tom Christie tries; Stephen Perofeta 7 con) England Under 20s 17 (Ben Earl, Alex Mitchell, Josh Bayliss tries; Max Malins con) HT: 40-7
