I think it may be something to do with keeping the event away from the MSNZ red tape. The VCC cuts off at 1960 (cars built before 31 December 1960 or later cars that are the same model of a car first built before 31 December 1960) - post 1960 falls in MSNZ's camp.The Roycroft meeting is run under the VCC. From the entries so far it looks as though it will be the largest grid of front engined Formula Juniors seen here.