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365GT4 400 400i 412
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400i engine:
 Type Colombo 60º V12
 Type number F 101 AC 000
 Capacity 4823 cc
 Bore and stroke 81 mm x 78 mm
 Compression ratio 8.8:1
 Maximum power 310 bhp @ 6500 rpm
 Maximum torque 303 lb ft (42 kgm) @ 4200 rpm
 Oil pressure 78-92 psi (5.5-6.0 kg/cm²) @ 6800 rpm
 Cylinder block and head Light alloy construction
 Timing gear (per bank) Twin overhead camshafts
 Valves 2 valves per cylinder
 Fuel injection Twin Bosch K-Jetronic systems
 Ignition Marelli Dinoplex AEC104660 control unit
 Marelli S158C distributor
 Marelli BAE202B coil
 Firing order 1-7-5-11-3-9-6-12-2-8-4-10
 Spark plugs Champion N6GY

Valve Timing
Valve timing should be measured with a clearance of 0.5 mm between tappet bucket and the camshaft lobe.
 Inlet valves open 43º BTDC
 Inlet valves close 38º ABDC
 Exhaust valves open 38º BBDC
 Exhaust valves close 34º ATDC
 Valve clearance - Inlet
                           Exhaust
 0.10 mm to 0.15 mm
 0.25 mm to 0.30 mm