Triumph unveiled the Dolomite Sprint in June 1973, although the launch had been delayed by a year; it had been due to go on sale in 1972.

A team of engineers led by Spen King developed a 16-valve cylinder head with all of the valves being actuated using a single camshaft rather than the more conventional DOHC arrangement. The capacity was also increased to 1,998 cc (122 cu in), and combined with bigger carburettors the output was upped to 127 bhp (95 kW). This represented a significant power increase over the smaller 1850cc variant, however it fell short of the original target of 135 bhp (101 kW).

Despite BL engineers being able to extract a reliable 150 bhp (112 kW) from test engines, the production line was unable to build the engines to the same level of quality, with production outputs being in the region of 125 bhp (93 kW) to 130 bhp (97 kW). This led to the original model designation, the Dolomite 135, being replaced at short notice with the Sprint name.

As a result of the use of this engine, the Dolomite Sprint has been claimed to be “the world’s first mass-produced multi-valve car”. While other multi-valve engines (notably the Lotus 907) were produced in volume, they were not used in mass production vehicles until after the introduction of the Dolomite Sprint. The design of the cylinder head won a British Design Council award in 1974. Performance was excellent, with 0–60 mph taking around 8.4 seconds, with a maximum speed of 119 mph (192 km/h). Trim was similar to the 1850, with the addition of standard alloy wheels (another first for a British production car), a vinyl roof, front spoiler, twin exhausts and lowered suspension. By now seats were cloth on the 1850, and these were also fitted to the Sprint.

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