 Kọ itẹsiwaju fun paragirafi yii - Parnell tẹsiwaju lati ṣiṣẹ P261 ti 2.1 liters fun Chris Irwin ati Piers Courage lakoko akoko Formula One ti o tẹle ti 1967, ati Bernard White ṣiṣẹ miiran fun David Hobbs ni British ati Canadian Grands Prix. Sibẹsibẹ, pẹlu P83 bayi ọkọ ayọkẹlẹ iṣẹ akọkọ, ẹgbẹ iṣẹ Bourne nikan ni P261 meji ni Agbaye Agbaye, botilẹjẹpe Stewart ṣe iṣakoso ipo kẹta ni 1967 French Grand Prix : nínú tirẹ. 