St. Clair was born in San Francisco, California and attended the University of San Francisco, where he played college football. He was drafted by the San Francisco 49ers in the third round of the 1953 NFL Draft. He played for the 49ers from 1953 to 1963 and was part of the team that won the 1956 NFL Championship.
During his time with the 49ers, St. Clair was known for his size and strength. He was 6'9" and weighed 265 pounds. He was a dominant force on the offensive line and was known for his ability to open up holes for the running backs. He was also a great pass blocker and was able to protect the quarterback from the opposing team's pass rush.
St. Clair was selected to the Pro Bowl three times during his career and was named to the NFL's All-Decade Team of the 1950s. He was inducted into the Pro Football Hall of Fame in 1990 and the College Football Hall of Fame in 1991.
St. Clair's career was marked by his size, strength, and dominance on the offensive line. He was a three-time Pro Bowl selection and was inducted into the Pro Football Hall of Fame in 1990. He was a key part of the San Francisco 49ers' success in the 1950s and is remembered as one of the best offensive linemen in NFL history.
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