Genuine Ducati FBF 955 916 Corsa Racing Vertical Cylinder Head Ported 37/31mm. This product data sheet is originally written in English. Elevate your Ducati’s performance with this genuine early 916 FBF Fast by Feracci Corsa Racing vertical cylinder head. The head has been ported to accommodate a 37/31mm valves increasing the engine’s power and efficiency. This is a single head left over from the remanence of BCM Ducati.