AUBURN HILLS, Mich.—Boston got past an old nemesis to set up a matchup with another rival.

Paul Pierce scored 27 points, Ray Allen had 17 and Kevin Garnett added 16 to lift the Celtics to an 89-81 victory over the Detroit Pistons on Friday night in Game 6 of the Eastern Conference finals.

Boston, which locked up with Detroit many times in the 1980s, will now rekindle another classic series in the NBA finals against the Los Angeles Lakers.

The Pistons were eliminated on their home court for the first time during a six-year run that included a trip to the conference finals each year and the 2004 title.