From Ferrari Wiki
The Ferrari 340 MM was a Ferrari Race car. It was a more powerful version of the 340 Mexico which was intended for the Carrera Panamericana. The use of Weber carburetor carburettors helped the 340 achieve 300 hp, some 20 more than its Mexico counterpart.
- Acerbi, Leonardo (2006). Ferrari: A Complete Guide to All Models. St. Paul: Motorbooks.