Ferrari 365 GT4 · 1975, here in our workshop.
When engineering still had character
Working on a Ferrari 365 GT4 V12 is no everyday job. It's an encounter with an era in which engineering wasn't hidden behind software, but visible, tangible and audible. An engine that breathes through six twin Weber 40 DCOE carburettors: mechanical precision from Bologna, built for enthusiasts who understand that performance starts at the foundation.
In our workshop, moments like these are not about speed, but about respect for the original. Every part tells a story, and every setting determines how that V12 will come back to life.
Weber Bologna, the origin of precision
Weber was founded in Bologna, Italy, in the 1920s and grew into the standard for high-performance carburettors in Europe. From motorsport to exclusive GTs: anyone looking for performance and reliability ended up at Weber.
Many of these carburettors carry the word "Brevettato" engraved on the body. That's Italian for "patented". It marks a time when Weber recorded and protected its technical innovations. Not a marketing term, but a statement: this design is unique, well thought out and technically ahead of its time.
For models like the Ferrari 365 that meant a fuel system that delivered not only power, but also finesse. Smooth pick-up, stable running and a direct throttle response, exactly what you expect from a V12 with Italian roots.
Six times twin, 40 DCOE in harmony
The Weber 40 DCOE is a legend in its own right. A twin sidedraught carburettor known for its direct character and tuning possibilities. On the Ferrari 365 GT4 six of them work together, each responsible for its share of the air and fuel mixture.
In practice that means:
- Complete disassembly and inspection of each carburettor
- Cleaning of all internal passages and jets
- Checking spindles, bushes and seals
- Overhauling diaphragms, gaskets and floats
- Precise setting up and synchronisation
Six units that each have to do their job perfectly on their own, but above all have to form a whole together. Only then does the character of the V12 truly come into its own.
Brevettato, more than a stamp
To us, the engraving "Brevettato Bologna" is more than a detail. It stands for a way of building that has become rare today. Design by hand, test on the road and on the circuit, improve until it's right, and only then put your name on it.
We carry that principle into every overhaul. No quick fixes, no compromises. Every part is judged on function, wear and fit. Only then does the engineering stay true to what Weber and Ferrari once had in mind.
Classics deserve craftsmanship
Projects like this remind us why we do this work. Not just to get an engine running again, but to keep a piece of motoring history alive. A Ferrari 365 GT4 is no everyday object, it's rolling heritage.
Whether it's an Italian V12, a British classic or a rare motorcycle: the philosophy stays the same. Engineering deserves attention, time and respect.
Do you know someone with a classic car?
Do you work with classics, or do you know someone who wants their vehicle maintained or overhauled at this level? We'd love to hear from enthusiasts who value quality and originality.
Carburateur Service Nederland · your carburettor specialists in the Netherlands · is a specialised overhaul workshop in Bussum. Visit us at Huizerweg 49, or choose collection or shipping. From abroad too: ship your carburettor to us well packaged, and after the overhaul we ship it back carefully packaged.