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In page Fiat 500:

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Like all Abarths, the differences are found in the mechanical upgrades that helped to increase its top speed to around 140 km/h (87 mph). The OHV 2 valves per cylinder inline-two engine, exhaust pipe, head and valve-springs were upgraded and specially designed pistons and camshaft fitted. It had an equal square bore and stroke ratio of 76 mm × 76 mm (2.99 in × 2.99 in) for a total displacement of 689.5 cc (0.7 L; 42.1 cu in) and the original single Solex 34PBIC carburetor was increased in size with a compression ratio of 9.8:1 developing 38 PS (37 bhp; 28 kW) at 5200 rpm and 57 N⋅m (42 lbf⋅ft) of torque at 4000 rpm.[2]