| Chief designer | Gioachino Colombo |
| Technical director | Enzo Ferrari |
| Numbers of frames built | 12 (6 during 1938 and 6 during 1940) |
| Chassis | tubolar oval girders with welded crosspieces |
| Wheel base | 2.50m |
| Track width | front and rear 1.25m |
| Weight | 620kg |
| Measures | length 4190mm, width 850mm, height 1000mm, Ground clearance 150mm |
| Steering | central, endless screw type |
| Wheels | aluminium alloy-spline drive wheels |
| Tyres | Pirelli 18x600 |
| Brakes | hydraulic drums al round, mechanical hand brake operating on the rear axle |
| Fuel tank | one rear tank + one tank on the right side for a total capacity of 170lt |
| Oil tank | in the cockpit's left side, 16lt of capacity |
| Cooling | watercooled, total capacity of the circuit 14 lt |
| Front suspension | Independent longitudinal parallelograms, transverse semi elliptic leaf |
| Rear suspension | independent, transverse semi elliptic leaf |
| Shock absorbers | idraulic and friction shock absorbers all round |
| | |
| Engine | Alfa Romeo 158 |
| Type | straight 8, two alloy blocks, screwed iron cylinders |
| Bore and stroke | 58*70mm |
| Engine capacity | 1479cc |
| Power | 195 HP (1939) - 225 HP (1939) |
| Rev | 7200 rpm (1938) - 7500 rpm (1939) |
| Compression ratio | 6,5:1 |
| Average pistons speed | 16.82m/sec (1938) - 17.5m/sec (1939) |
| Effective average pressure | 17.34kg/cmq (1938) - 18.23kg/cmq (1939) |
| Cylinder head | mated with the engine's blocks, emispheric head design |
| Valvetrain | 2 overhead valves for each cylinder, 100° angle |
| Valves clearance | 30mm inlet and exhaust |
| Crankcase | mated with chassis trough six bearings |
| Crankshaft | cemented steel, counterbalanced |
| Crankshaft bearings | 9 bronze bearings with antifriction metal |
| Connecting rod bearings | - |
| Camshafts | double overhead camshafts operating on five bearings |
| Valve control | - |
| Distribution control | with cylindrical gears, front position |
| Fuel feed | under pressure operated by volumetric compressor, triple choke carburettor |
| Compressor | Alfa Romeo type - engine rev * 1.32 pressure 0.8Kg/cmq |
| Ignition | magneto generator, 14mm gauge spark plugs |
| Lubrication | forced with 3 oil pumps |
| Cooling | watercooled with one centrifugla pump and one front radiator |
| Trasmission | fixed drive shaft composed by two half shafts with central bearing |
| Clutch | dry, steeel and aluminium alloy multiple discs |
| Gearbox | four speed + reverse gear, mated with differential housing, lateral shift |
| Gear ratio | I 1:2.39 |
| | II 1:1.66 |
| | III 1:1.284 |
| | IV 1:1 |
| | R 1:2.30 |
| Rear axle | - |
| Differential ratio | 16/38 |
