In 1947 he joined the Portland Beavers of the Class AAA Pacific Coast League .
After batting . 301 with Beavers in 1948 , Silvera made his major league debut with the New York Yankees for four games at the end of the season .
In 1947 he joined the Portland Beavers of the Class AAA Pacific Coast League , and after batting . 301 with Beavers in 1948 , Silvera made his major league debut with the New York Yankees for four games at the end of the season .