In football, as a senior, he was named the Class AA Lineman of the Year after leading his team to three Region Championships.
In track and field, he added three state discus and one shot put AA titles.
He went to the AFC-NFC Pro Bowl from 1971 through 1974) In 1970, Stanfill started on the 10-4 Dolphins and again unofficially led the team with sacks, this time with six.
Stanfill was unofficially second on the 17-0 Super Bowl winning Dolphins team with 10 sacks (behind left defensive end Vern Den Herder's 10½) and was voted All-Pro by the Associated Press.
His unofficial 1973 sack total still stands as the team record, although All-Pro Jason Taylor tied that mark in 2002 [4][usurped].
On October 7, 1973, Stanfill set the unofficial single-game sack record versus the New York Jets.
In 1974, Stanfill unofficially led the Dolphins defense in sacks with 10 and was voted a second-team All-Pro by the NEA and Pro Football Writers Association and was an All-AFC selection for the fourth straight season.
He was featured in a Sports Illustrated article that detailed the injuries to former NFL players, which also included Hall of Fame quarterback Johnny Unitas, Earl Campbell, Joe Jacoby, Curt Marsh, Harry Carson and others.
SI reported that Stanfill had three surgeries, from August 1993 to January 1996, to fuse four vertebrae in his spine, a problem that started when he jammed his neck during an exhibition game in 1975.
According to Stanfill, the surgeries on his spine caused a neck pain so severe he could not tip his head back, had little use of his left thumb, and experienced considerable loss of hand and arm strength.
[3] He was found to have had chronic traumatic encephalopathy, or C.T.E., the degenerative brain disease associated with repeated head trauma.