John Harbaugh has won big.

And the Super Bowl champion coach — who ranks third in wins among active NFL head coaches (184) and seventh all-time in playoff wins (13) —  is giving the Giants permission to dream big after their 27-21 overtime win in Houston.

As a 10-point underdog, the first-year Giants coach led the team to its first road win of the season.

“It’s a massive energy shot in the arm,” Harbaugh said of the win. “It’s a reward. Now you gotta make something of it. It doesn’t mean anything if you don’t build on it. [Actually], it means something, but it doesn’t mean we’re gonna win a championship yet. It means we have an opportunity, though.”