SACRAMENTO, Sept. 8 — The name of Charles Manson may dominate the case of Lynette “Squeaky” Fromme, although prosecutors say they find no evidence of a conspiracy in the attempted assassination of President Ford.

Manson, convicted of murder in the deaths of nine persons, is reputed by some authorities to still have a strong influence over some of his communal “family,” despite the fact he is in prison.

Among the most loyal is Miss Fromme, 27, charged with attempted murder of the President after pointing a loaded .45 caliber pistol at Ford from an arm’s length away as the President shook hands with well-wishers near the state Capitol on Friday.

She once said of the Manson family: “They’re my life.”

FBI agents who interviewed Manson in his San Quentin jail cell over the weekend say he denied any role in a conspiracy to kill Ford but refused to answer specific questions.

U.S. Atty. Dwayne Keyes and Sacramento Police Chief William Kinney both said during the weekend they had no evidence of any Manson involvement. And Miss Fromme’s roommate, Sandra Good, another loyal Manson follower, said Manson had nothing to do with the incident.

FBI spokesman Tom Griffin said Manson was interviewed at San Quentin Prison by two agents. “In one and a half hours we came up with absolutely nothing of any evidentiary value or any lead value either,” he said. “We got no answers to specific questions as to the actual event or any conspiracy or plan.”

Griffin said Manson, 40, was cooperative but only “to the standpoint of giving out his theory on how he thinks the world should be. He’s willing to talk about that.”

Ford, meanwhile, relaxed on the golf course both Saturday and Sunday. White House officials said the President will not change any travel plans because of the gun incident. He flies to New Hampshire and Missouri this week.

In recent months, Miss Fromme and Miss Good have launched new efforts to promote Manson’s philosophy. They visited newspaper offices and drafted “press releases” quoting Manson.

In July, they contacted an Associated Press reporter who had covered Manson’s trial. Miss Fromme said in a statement joined by Miss Good: “If Nixon’s reality wearing a new Ford face continues to run the country against the law, your homes will be bloodier than the Tate-LaBianca houses and My Lai put together.”

The FBI’s Griffin said, “I think our Los Angeles office indicated it had clipped the story and it was part of our files. I don’t know if it was disseminated beyond those files.”

Miss Fromme, being held under $1 million bail, has not entered a plea. Her arraignment was continued until Thursday. By then, prosecutors hope to have a federal grand jury indictment charging her under the new federal law covering assassination attempts on presidents.

Miss Good, 31, insisted at a Saturday news conference that Manson did not order Miss Fromme to kill Ford. “Squeaky acted totally of her own volition,” she said. “Manson didn’t order her to do this. Squeaky is acting on the will of many people.”

Stephen Kay, one of Manson’s prosecutors, had said Friday: “The Manson girls just don’t act on their own. They act at the behest of Charles Manson. I think Charles Manson had a hand in it.”

At Manson’s trial in 1970, his three women co-defendants confessed to murdering actress Sharon Tate and six others but insisted Manson wasn’t there and didn’t give the orders. Circumstantial evidence and a witness who placed him at the scene of two of the goings led to his conviction and death sentence, which has subsequently reduced to life in prison. He was later convicted in other killings as well.

Manson has been locked up for five years. Followers, including Miss Fromme, are forbidden to visit him and he communicates only by letters. The women’s recent “press releases” included statements from Manson’s letters.

Keyes, who examined letters taken from Miss Fromme’s apartment, said he saw no evidence of a conspiracy. Kinney said, “We have nothing in our files that indicates the Manson girls — she in particular — had ever threatened the President of the United States.”

A letter purporting to be signed by Manson was received by several state legislators Friday, the day Miss Fromme was arrested. It said, “I’ve told you people over and over — I can release thoughts that will destroy you,” and warned that “the other justice is gonna catch up with you.”

By LINDA DEUTSCH