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365GT4 400 400i 412
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400 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 340 bhp @ 6500 rpm
 Maximum torque 347 lb ft (48 kgm) @ 3600 rpm
 Oil pressure - min-max 64-92.5 psi (4.5-6.5 kg/cm²)
 Cylinder block and head Light alloy construction
 Timing gear (per bank) Twin overhead camshafts
 Valves 2 valves per cylinder
 Carburettors - automatic gearbox 6 x Weber 38DCOE 110/111
 Carburettors - manual gearbox 6 x Weber 38DCOE 110M/111M
 Ignition Twin Marelli S138C distributors
 Twin Marelli BZR201A coils
 Firing order 1-7-5-11-3-9-6-12-2-8-4-10
 Spark plugs Champion N6Y

Valve Timing
Valve timing should be measured with a clearance of 0.5 mm between tappet bucket and the camshaft lobe.
 Inlet valves open 42º 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

Ignition Timing
 Static advance 11º
 Automatic advance @ 3250 rpm 12º ±1
 Automatic advance @ 5000 rpm 30º ±1
 Contact breaker gap 0.32 - 0.38 mm (0.012 - 0.15 inches)
 Spark plug gap 0.60 - 0.70 mm (0.024 - 0.28 inches)