Some F1 single-seaters were modified (extended wheel base and engine with 4400 cc cylinder capacity) to have a go at the Indianapolis adventure. One car was assigned to Alberto Ascari for the 500 Mile race in 1952, which explains his absence from the Swiss GP on 18 May (won by Taruffi), because he was busy with the qualification trials for the American race.

Competing with the American cars, with a rougher design but perfectly suited to this type of race, was disappointing because Ascari had to withdraw with a broken wheel and the other cars, purchased by American drivers, failed to qualify.

Type front, longitudinal 60° V12
Bore/stroke 79 x 74.5 mm
Unitary displacement 365.17 cc
Total displacement 4382.09 cc
Compression ratio 13 : 1
Maximum power 279 kW (380 hp) at 7500 rpm
Power per litre 87 hp/l
Maximum torque -
Valve actuation single overhead camshaft per bank, two valves per cylinderr
Fuel feed three Weber 40 IF4C carburettors
Ignition twin spark plugs per cylinder, twin magnetos
Lubrication dry sump
Clutch multi-plate
Frame tubular steel
Front suspension independent, unequal-length wishbones, lower transverse leaf spring, Houdaille hydraulic shock absorbers
Rear suspension de Dion, lower transverse leaf spring, twin radius arms,Houdaille hydraulic shock absorbers
Brakes drums
Transmission 4-speed + reverse
Steering worm and sector
Fuel tank capacity 195 litres
Front tyres 6.00 x 16
Rear tyres 7.50 x 18