He subsequently worked for Maserati (1950–55), developing the Maserati A6 (A6GCM 1952; A6SSG 1954), and Maserati 250F, that had been initiated by Gioacchino Colombo who left the company in 1955. Bellentani continued as a consulting engineer for Ferrari (1956–63) on cars as Ferrari 412 S (1957) and the 1-litre ASA Ferrarina (1962). He also worked for the Bellentani Riccardo Modena (B.R.M.) company (1955–1957), which had been formed by his brother Riccardo Bellentani. B.R.M. was mostly involved in two-stroke engines, and continued to operate under Riccardo's son, Antonio Bellentani.
Bellentani died in Modena in 1968.
- Candini, Dante (2002). Le moto Maserati e l'artigianato motociclistico modenese. Il Fiorona.