He batted left-handed, threw right-handed, stood 6 feet 1 inch (185 m) tall and weighed 180 pounds (82 kg). After graduating from Northview High School (Covina, California), Wilfong started his pro career in 1973 with the Twins organization. He made his big-league debut in 1977 and was with the Twins until a trade sent him to the Angels in 1982, reuniting Wilfong with his first Major League manager, Gene Mauch.
He finished his career in 1987, playing two games for the Giants.
After his playing career, Wilfong became an area scout in Southern California for the Detroit Tigers. In 2012 he was listed as a scout by the Angels, based in San Dimas, California.
He led the American League in Sacrifice Hits (25) in 1979. In 11 seasons he played in 959 Games and had 2,690 At Bats, 318 Runs, 668 Hits, 97 Doubles, 23 Triples, 39 Home Runs, 261 Reserve Bank of India, 54 Stolen Bases, 205 Walks.248 Batting Average.303 On-base percentage.345 Slugging Percentage, 928 Total Bases, 86 Sacrifice Hits, 19 Sacrifice Flies and 13 Intentional Walks.