Engine: front mounted, based on Fiat 500; cast-iron block, light alloy head; Stanguellini production since 1950 (cast-iron block, light alloy head)
Cylinders: 4 (6,5 mm offset to the longitudinal axis since 1950)
Bore and stroke: 55×78 mm (59×68 mm since 1950; 62×61,5 mm or 58×70 mm since 1952)
Capacity: 741 cc (743 cc since 1950; 743 or 741 cc since 1952)
Max output: 40 bhp at 6000 rpm (50 bhp at 6500 rpm since 1950; 60 bhp at 7500 rpm up to 75 bhp at 8500 rpm since 1952)
Lubrication: full pressure by submerged gear-type oil pump
Cooling: forced water circulation
Valve gear: pushrods; double chain-driven overhead camshaft since 1950)
Fuel feed: 2 Weber updraught carburetors (2 Weber DRN 32 vertical carburetor since 1952; 2 Weber double-choke DCO carburetors since 1954)
Ignition: coil and distributor
Clutch: single dry-plate
Gearbox: 4 forward speeds + reverse (5 speeds + reverse since 1960)
Chassis: frame with side and cross tubular members
Front suspension: independent, lower A arms with upper transversal leaf spring, hydraulic telescopic shock absorbers (lower and upper arms, coil springs with coaxial telescopic shock absorbers since 1956)
Rear suspension: live axle with semi-elliptic spring and hydraulic shock absorbers (reaction rods, coil springs and coaxial telescopic shock absorbers since 1953)
Brakes: drums
Wheelbase: 2000 mm (2020 mm since 1953)
Tracks: front 1163 mm; rear 1133 mm (front 1160 mm; rear 1130 mm since 1953)
Tire size: front 4.25-15; rear 4.25 -15
Body: two seater-roadster fitted with motocycle-type mudguards; streamlined body since 1953
Dry weight: 400-450 kg
Production period: 1948-1958