[2] He was selected by the Boston Patriots in the sixth round (46th overall) of the 1963 AFL Draft.
He played for the St. Louis Cardinals from 1963 to 1967, for the New York Giants in 1968, and for the San Francisco 49ers from 1969 to 1970.
[3] He went to one Pro Bowl during his eight-year career, and was selected to one All-Pro team.
Silas played for the Portland Storm of the World Football League in 1974.
[citation needed] This biographical article relating to an American football defensive lineman born in the 1940s is a stub.