Patrick_Mucci,
Ken Venturi was interviewed by Art Stricklin for PGA Partners Club Online. The link to the article is at the bottom of the post.
In the interview Venturi says very clearly that he picked Snead as his partner for the final round in 1956.
In the posts I quoted you said that your source who was close to the situation said that Venturi's version of what happened is untrue. If it is untrue then Venturi is lying, whatever the motive.
From the interview
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PARTNERS: What was the controversy about who you were paired with in that final round?
VENTURI: At that time, Byron Nelson traditionally played with the leader on the last day. But Clifford Roberts came to me and said, "We don't want you to play with Byron because he's your mentor. We know you're going to win. However, we don't want it to be a hollow victory because people might say Byron Nelson helped you." I said, "Mr. Roberts, you're absolutely right." He said, "You may pick anyone you want." Feeling I was going to win, and since I had been taught by Byron and had played with Hogan in '54, I thought I'd like to walk up the 18th fairway with Sam Snead. And so I picked Snead. After I lost, a sports writer, who shall remain nameless, screwed up the whole story. The writers asked if they had changed the pairings on me. I said, "Yes, they did. They didn't want an amateur to win and have it be a hollow victory, and I agreed that was right." They asked, "Did Sam Snead talk to you during the round?" I said, "He tried to, but he knew how nervous I was, so he decided it was best to leave me alone." After the round, my mother was crying because I had lost, and I said to her, "Don't worry, mom, we'll show 'em. We'll win the Open." So this writer's story says the Masters had changed the pairings because they didn't want an amateur to win, that Sam Snead had given me the silent treatment and that Venturi vows revenge and says he will win the Open. When I went to Augusta the next year, the people booed me. I lived with that for a long time, until Bobby Jones and Cliff Roberts brought me in, and Roberts said, "Ken, I want to apologize. I know now that you did not say those things." I didn't really care who else knew, as long as Bobby Jones did. Jones was the first to my aid. He told Roberts, "Cliff, remember what I told you. I told you that young man did not say that. I have watched this young man."
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http://visitors.partnersclubonline.com/mag_articles/venturi.asp