The Boston Bruins booked a spot in the Stanley Cup Final on Friday after beating the Pittsburgh Penguins 1-0 to sweep their Eastern Conference championship series.

The Bruins won the best-of-seven series 4-0 and will play either the Chicago Blackhawks or Los Angeles Kings for the Cup.

Boston's Adam McQuaid belted home a slapshot from distance during a line change early in the third period to send the Bruins to their second Final in three years.

Boston beat Vancouver to win the Stanley Cup in 2011.

"We were a little sluggish in the first two periods and we said, we got to win a period in order to win a series," Boston's Milan Lucic said.

"I remember before the game telling McQuaid he was going to get one today and it ended up being a huge one for us tonight." said Bruins goaltender Tuukka Rask, who saved 26 shots on Friday and conceded just two goals in the four-game series against the top ranked team in the East.

Patrice Bergeron said team mate Rask made the difference.

"I can't say enough (about him)," added Bergeron.

"He is the reason why we are here and he was a huge part of us winning this series."

Boston will meet either the 2010 champions Chicago or the reigning Stanley Cup holders Los Angeles. The Blackhawks lead that series 3-1.

(Reporting by Ben Everill in Los Angeles; Editing by Peter Rutherford)