Nuggety and rugged, Adcock earned a reputation as a dashing and reliable defender who was a key member of Sturt's five consecutive premiership wins from 1966 to 1970. His last SANFL game for Sturt was their 1974 Grand Final win to finish his career with six premierships.
At interstate level Adcock was a regular representative for South Australia, with some of his 20 state games taking place at the 1966, 1969 and 1972 carnivals. He was selected into the All-Australian team in the 1966 Hobart Carnival.
Adcock's contribution to football in South Australia was recognised when he was among the first players inducted into the South Australian Football Hall of Fame in 2002. He was named in the back pocket in Sturt's official 'Team of the Century'.
Victoria (VFL) 16.23 (119) defeated South Australia 7.9 (51), at North Hobart Oval, 11 June 1966, crowd: 23,764 Western Australia 13.11 (89) defeated South Australia 10.14 (74), at North Hobart Oval, 13 June 1966, crowd: 13,969 South Australia 21.20 (146) defeated Victoria (VFA) 9.11 (65), at North Hobart Oval, 16 June 1966, crowd: 10,199 South Australia 14.7 (91) defeated Tasmania 9.13 (67), at North Hobart Oval, 18 June 1966, crowd: 23,368