 The unit retained the cylinder stroke of the previous engine, but the cylinder bore was increased to .The Solex 32 carburetter was unchanged but a raised compression ratio provided for a small increase in claimed maximum power which, for the models as displayed at the motor show in October 1955, now given as at 4,500 rpm or at 4,800 rpm (and more in some low volume more highly tuned versions).Externally the Aronde for 1956 had an updated 9 Aronde body, with restyled front and rear ends.