The U.S. Boxing Association yesterday stripped Stanley Ross of the cruiserweight title he won against Boone Pultz in a 12-round split decision Dec. 7 at the D.C. Convention Center.

Ross tested positive for marijuana in the first of two urine samples taken the night of the fight. Because the second sample also proved positive, USBA president Bob Lee yesterday ruled the contest a no-decision and gave the title back to Pultz, whose record now stands at 12-0.

"I can't explain what a second chance means," Pultz, a native of Washington, said in a telephone interview. "That fight was such an experience, it was really a blessing. I had switched promoters and management and had been off for a long time. I was out of shape and just wasn't ready.

"I guess it took something like this to wake me up. We're going to win titles, but more important than that, my dream of remaining undefeated is restored. I'm delighted with the decision and working hard again to get into the best shape possible. But if it had taken a loss like that to wake me up, that would have been okay, too." . . .

Barry McGuigan of Ireland, the World Boxing Association featherweight champion, was named the WBA fighter of the year. McGuigan won the title in 1985 on a decision over Eusebio Pedroza and defended it by stopping Bernard Taylor in eight rounds.

The WBA's fight of the year was Wilfredo Gomez's decision over Rocky Lockridge for the WBA junior lightweight title, and victory of the year was Michael Spinks' decision over previously unbeaten Larry Holmes for the International Boxing Federation heavyweight title.