Iharos competed, without major success,[2][3] in the 1952 Summer Olympics and 1954 European Championships.
The 5000 m record only stood eight days before broken by Volodymyr Kuts, but Iharos reclaimed it with a time of 13:40.6 on 23 October 1955.
The 5000 m record was broken again on 19 June 1956 by Gordon Pirie, and this time he wasn't able to reclaim it.
The 1500 m record was first equalled by László Tábori and then beaten on 3 August 1956 by István Rózsavölgyi – both fellow Hungarians and pupils of Iglói.
(He'd be part of another Hungarian team effort in another rarely contested relay, 4 × one mile, in 1959.)