Engine 12 cylinders in 65° V layout Bore and stroke 3.46 x 2.95 in Individual cylinder capacity 27.8 cu. in Total cylinder capacity 334.0 cu. in Compression ratio 10.6:1 Maximum power at 6250 rpm 436 hp Maximum continuous speed 7000 rpm Maximum peak speed 7250 rpm Peak torque at 4500 rpm 398 lb.ft Four overhead camshafts Four valves per cylinder Bosch static electronic ignition Bosch Motronic M5.2 injection Engine weight 518 lb	Chassis The 456M has an extremely rigid steel tubular chassis, where the body is welded for a structural linkage. The body is in light aluminium alloy - for weight reduction - and it's welded to the steel chassis thanks to the intermediate laying of a special material, Feran. It is well known that aluminium and steel are incompatible for welding, due to their different features; the laying of a steel foil, chemically treated with Feran, on one of them, allows proper welding to be achieved; thus light aluminium and rigid and sturdy steel can be joined. To reduce weight, without loosing stiffness, the bonnet of the 456M is in carbon fibre. The door windows are flush with the doors and feature an automatic device that - during door closing and opening - controls the window travel perfectly to achieve optimum sealing. The 456M has new weather-strips between windows/body, which enhance the aerodynamic flow and aesthetics. To improve the luggage compartment opening/closing function, new struts have been introduced. Thanks to the new style of the front and of the underbody at the back, the 456M has achieved an evolution in aerodynamic efficiency. In particular, the new rear fixed wing - integral to the bumper gives a high aerodynamic functionality of this area. The front axle negative lift co-efficient and the penetration co-efficient were improved thanks to the new design of the engine bonnet and of the front bumper/spoiler. The latter, thanks to its special structure, sends the air flow to the rear wing, keeping a good cx, offering high speed stability.
Top speed 186 mph 0-60 mph 5.1 s 0-1/4 mile 13.4 s 0-1 mile 33.4 s