Background
By the late 1960’s the E Type’s sales in the critical North American market had started to falter a little. By the end of the 1960’s US preferences were favouring lots of cylinders and the more the better. With American marques jamming V8’s into everything that could accommodate one, the straight-six E-Types were starting to look a little quaint by comparison.
Luckily Jaguar had a potential solution sitting in mothballs back at Browns Lane. As early as 1951 Claude Bailey had produced a prototype engine destined for an intended Le Mans car. The original design was for an 8-litre V12 with twin double overhead camshafts and a lofty 8,000 rpm red line. The race program was cancelled in 1957 but the V12 engine development continued to creep ahead. By the 1960’s the unit had shrunk to 5-litres and was being prepped for use in the XJ13 for a proposed return to Le Mans. That never happened either. Following this false start, engineers Hassan and Mundy were instructed to develop the V12 for road use. The quad cam unit became a twin cam and profiles and valve springs were softened with the redline dropping down to 6,500 rpm.
It was this unit that debuted in the long nose of the Series III E Type when it first appeared in 1971 and had a material effect on the Americans’ view of the 10-year old E Type. Despite some softening the engine was still good for a robust 266 bhp, however. A contemporary road test of a manual Roadster, like our car here, was able to record a highly impressive 6.4 second 0-60 mph time and roar on to hit 146 mph. A truly eye-widening performance for the time. Better still, this class leading performance was available at a surprisingly attainable price point. At launch in 1971, a V12 Roadster unadorned with extras retailed at £3,123 or the equivalent of 108 times the period’s average weekly wage in the UK. Using that same measure today equates to around £60,000.
The subsequent success of the Series III translated into a relatively large production output of 15,287 cars in total. However, only around half of the total were Open Two Seaters (OTS) with a mere 24% of those being right hand drive cars, further underlining the deserved overseas success of these thoroughbreds.







