The chassis was a simple steel box section, welded together and very rigid. Construction retained the traditional split between chassis and body, which facilitated the provision of special bodied versions though in practice the overwhelming majority of cars were delivered with the standard steel body shell, produced by Pressed Steel, and employing light weight aluminium based alloy for the doors, bonnet/hood and boot/trunk lid. The car was 5.38 m (212 in) long, 1.90 m (75 in) wide, and massed 1.95 tonnes. The engine was a 155 hp / 4000 rpm 4.9 L six-cylinder unit with inlet over exhaust valves: twin SU carburettors were added in September 1957. The standard transmission was a four-speed automatic. The turning circle was 41 feet 8 inches (12.70 m).
Brakes were hydraulic and assisted by the Rolls-Royce mechanical servo with 11 in (279 mm) drums and suspension was independent coils at the front and semi-elliptic springs at the rear. Twin brake master cylinders were incorporated from April 1956.
Power steering became an option in 1956 along with air conditioning.
A long-wheelbase version, lengthened by 4 in (102 mm), was also made available in September 1957, outwardly very similar to the existing car, but offering improved leg space for rear-seat passengers.
Silver Cloud I 1956:
max speed: 102.9 mph (165.6 km/h)
acceleration 0-60 mph (97 km/h): 13.5 seconds
fuel consumption: 14.5 miles per imperial gallon (19.5 L/100 km; 12.1 mpg-US).
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