The final
iteration of the P5 appeared in September 1967.[7] Now powered by the
3,528-cubic-centimetre (215.3 cu in) Rover V8 engine also used in the 3500, the
car was badged as the "3.5 Litre", and commonly known as the 3½
Litre. The final letter in the "P5B" model name came from Buick, the
engine's originator. Rover did not have the budget to develop a new engine,
hence they chose to redevelop the lightweight aluminium Buick engine, making it
considerably stronger. While this added some weight, it still maintained the
engine's light and compact features. The Borg Warner Type-35 automatic
transmission, hydrosteer variable ratio power steering and front Lucas fog
lights were now standard.
Output of
160 metric horsepower (120 kW) was claimed along with improved torque.[7] When
introduced in 1967 the Buick-designed V8 produced 160 PS (118 kW; 158 hp) at
5,200 rpm and 210 lb⋅ft (280 N⋅m) of torque at 2,600 rpm. The greater power of the engine, along with
its lower weight, provided improved performance as well as fuel economy.
The
exterior was mostly unchanged, apart from bold "3.5 Litre" badging, a
pair of fog lights which were added below the headlights, creating a striking
four-light array, and the fitting of chrome Rostyle wheels with black painted
inserts. The P5B existed as both the 4-door coupé and saloon body style until
end of production. Production ended in 1973, by when 9,099 coupés and 11,501
saloons had been built.
The 3½
Litre saloon variant was a favourite of high-ranking government ministers, and
served as Prime Ministerial transport for Harold Wilson, Edward Heath, James
Callaghan, and Margaret Thatcher. As testament to their suitability, the last
batch of P5Bs to roll off the Rover line in June 1973 was purchased by the
British government and placed in storage, to be released for government use as
required. For that reason, registered relatively new-looking P5s were therefore
still familiar sights in Westminster for more than a decade after production
had ended.
When
Margaret Thatcher entered Downing Street in 1979 after her election victory,
she was driven in a 1972 model. It was during Thatcher's eleven-year tenure
that the P5 was eventually phased out as a Prime-Ministerial car, in favour of
the Jaguar XJ.
Queen
Elizabeth II also owns an Arden Green Rover P5B Saloon "JGY 280",
which is on display at the Heritage Motor Centre, Gaydon, Warwickshire and was
seen in the 18 May 2003 episode of BBC motoring show, Top Gear.
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