Stephen Spark compiled horses performance records starting in 1983 on his typewriter. Mighty Thor raced from 1972 (3yo) through to 1979 (10yo). Career: 22 wins 22 seconds 20 thirds 147 starts.Typed document in black and red ink.harness racing, australasian harness racing, horse career, performance records, bendigo harness racing club, bhrc, mighty thor, j dewhirst, john dewhirst, b morse, brian morse