Batting for Otago against Canterbury in Christchurch in 1931–32, he made 338 not out at a run a minute out of a total of 589 all out, in a match that Otago nevertheless lost. It was the highest first-class score by a New Zealander until Bert Sutcliffe beat it with 355 in 1949–50. He also held the record as the highest-scoring New Zealand batsman with 7769 runs until Sutcliffe surpassed it in 1953. Blunt's best first-class bowling figures were 8 for 99 for Otago against Auckland in Dunedin in 1930–31.