LOS ANGELES — This was how the Boston Celtics of yesteryear — Cous and Russell and Bird and Hondo and the Chief — would do it. Digging deep, they fought for every loose ball, scrapping with grit and guts, champions clad in green.

These Celtics are no different.

And they are just one win from another NBA title.

In their comeback season, Boston saved its biggest one of all for the finals.

The Celtics rallied from a 24-point deficit and beat the Los Angeles Lakers 97-91 on Thursday night to take a commanding 3-1 lead in this history-rich series and move within one victory of a 17th championship that seemed impossible a year ago.

“I don’t want to get overjoyed,” Paul Pierce said. “I want to go out there to try and win Game 5 on Father’s Day and then I’ll be able to breathe. Right now, I’m waiting to exhale.”

He’s not alone.

A rivalry between the league’s two most storied franchises — with some of the game’s biggest names and biggest moments — now has a rally for the ages.

No team had ever overcome more than a 15-point deficit after the first quarter, and Elias Sports Bureau said it was the largest comeback in the finals since 1971. One thing’s for sure, it will forever be remembered in the annals of Celtics-Lakers lore.

When the final horn sounded, Pierce, an L.A. kid playing in front of family and friends, doubled over in exhaustion and exuberance. The Celtics, the team he stuck with through 10 years, including a 24-win season in 2006-07, had done the impossible.

“It’s definitely a great win, one that you’re going to put up there in the library and break back out one day for your kids to watch,” Pierce said. “But I want nothing more than that ring right now.”

Pierce scored 20 points, Kevin Garnett had 16 points and 11 rebounds and Ray Allen had 19 points, two coming on a marvelous reverse layup in the fourth as Boston’s Big Three, thrown together last summer by general manager Danny Ainge to revive a franchise accustomed to hanging banners from the rafters, put the Lakers on the brink of a summer vacation.

It took an epic comeback to do it, and now the Celtics can reclaim their place atop pro basketball with a win in Game 5 on Sunday night in Los Angeles.

No team has ever recovered from a 3-1 deficit in the finals.

Kobe Bryant scored 19 points on 6-of-19 shooting but the league’s MVP couldn’t rescue the Lakers when they needed him most. Lamar Odom had 19 points — 15 in the first half — and Pau Gasol, whose addition in a midseason trade was supposed to give the Lakers their final piece to complement Bryant, had 17 points and 10 rebounds.