From a prosperous family, Villoresi could afford to buy a car and began competing in local rallies at the age of twenty-two with a Lancia Lambda and a few years later acquired a Fiat Balilla with which he and his brother Emilio competed in the Mille Miglia.
Procedente dunha familia próspera, Villoresi podía permitirse o luxo de comprar un coche e comezou a competir en rallys locais á idade de vinte e dous anos cun Lancia Lambda e uns anos máis tarde adquiriu un Fiat Balilla co que el e o seu irmán Emilio competiron na Mille Miglia.