That same year, Porsche bankrolled Siffert's seat in a works March Engineering F1 since the German company did not wish to lose one of their prize drivers to rival Ferrari.
Ese mesmo ano, Porsche financiou o asento de Siffert no equipo oficial de F1 March Engineering xa que a compañía alemá non quería perder a un dos seus pilotos gañadores co seu rival Ferrari.