Snell's former world records of 1:44.3 for 800 m (3 February 1962) and 2:16.6 for 1000 m (12 November 1964), remain the New Zealand national records for these distances. His 800 m record remains the fastest ever run over that distance on a grass track, and is also the oldest national record recognized by the IAAF for a standard track and field event. His 800 m record was also the Oceania continental area record for 56 years, until 20 July 2018.