Bruins fans celebrate in a euphoric frenzy outside Garden after sweep of Pens

Bruins in six. Maybe seven games. Or even four straight again.

Those were the forecasts for the Stanley Cup finals among delirious Bruins fans who streamed out of the TD Garden Friday night after the B’s completed a four-game sweep-for-the-ages of the Pittsburgh Penguins.

“I’m pumped,” said Conor Murphy, 22, outside Boston Beer Works near the Garden after the Bruins’ tight 1-0 victory that left many fans’ nails bitten down and their fists clenched.

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Murphy, a Wilmington resident who wore a Jaromir Jagr T-shirt and a foam Bear cutout on his head, said he thinks the Bruins will ultimately prevail and win the Cup against either the Chicago Blackhawks or the Los Angeles Kings, who are currently in a playoff to reach the finals.

“I think we’re physical enough to [beat] either one of them,” Murphy said.

He was certainly not alone in his optimism.

Causeway Street and its surroundings morphed into a sea of black and gold after the game, as ecstatic fans undaunted by the heavy rain launched an impromptu block party.

Total strangers hugged and swapped high-fives. Couples danced on the sidewalk. And cries of “We Want the Cup” thundered into the night sky.

It will, of course, be the Bruins’ second Stanley Cup title in three years if they prevail in the next round, and fans appeared giddy over the prospect.

“Extraordinary,” said Tara Fulco, 23, a Bay State native now living in Maryland, when asked for her take outside Beer Works.

“Pure ecstasy, quote that,” said her friend, Meghan Malia, 23.

They were joined by Ryan Connolly, 21, of Westford, who wore a B’s jersey and gave a nod to goalie Tuukka Rask.

“We’ve got Tuukka to thank” for the victory, said Connolly, shouting out a goalie whose post-season run has drawn comparisons to former B’s netminder Tim Thomas’s legendary performance in the 2011 Stanley Cup drive.

Like every other fan polled on the street Friday, he said he fully expects another title for the Bruins.

“Diehard Bruins fan,” he said.

Though fans outside the Garden were boisterous, they appeared to be celebrating in an orderly fashion for the most part.

Boston police were out in force directing vehicle and pedestrian traffic, and no arrests were seen immediately after the game.