 In 1976 O'Brien helped Kilkenny to a National Hurling League title, however, the side later lost their provincial crown to Wexford.In 1978 Kilkenny were back as Leinster champions with 'Chunky' winning his sixth provincial medal.Unfortunately for Kilkenny, Cork completed a three-in-a-row, winning the All-Ireland final by 1-15 to 2-8.