posted by G.Pence here,
http://www.network54.com/Forum/119419/message/1329165471/Re-+Heads+bangers
Nominal combustion chamber volumes
58cc = Boss 302, Australian 302C
63cc = 1970 M code
66cc = 1971 M code
75cc = 1971 - 1972 Q code, Australian 351C
76cc = 1970 2V (H code)
78cc = 1971 - 1974 2V, 1973 - 1974 Q code, All 351M, All 400
there'll be phantoms, there'll be fires on the road... and the white man dancing