As its nomenclature suggests, the XK150 was a progressive development of the XK120 and XK140, retaining the same basic chassis, 3.4-liter engine and 4-speed Moss transmission of its predecessors while benefiting from a new, wider body that provided increased interior space and improved visibility courtesy of a single-piece wrap-around windscreen, replacing the XK140’s divided screen. Cleverly, the new body used many XK120/140 pressings, the increased width being achieved by means of a 4”-wide central fillet. A higher front wing line and broader radiator grille were other obvious differences, but the new model’s main talking point was its Dunlop disc brakes. Fade following repeated stops from high speed had been a problem of the earlier, drum-braked cars, but now the XK had stopping power to match its prodigious straight-line speed.
Introduced in the spring of 1957, the XK150 was available at first only in fixed and drophead coupe forms, the open Roadster version not appearing until the following year. At 210bhp, the standard 3.4-liter engine’s maximum power output was identical to that of the XK140, so performance was little changed. Overdrive and a Borg-Warner automatic gearbox were the transmission options, the latter becoming an increasingly popular choice, while a Thornton Power-Lok limited-slip differential was available for the XK150S.
This very well sorted XK150 Fixed Head Coupe was delivered new in 1961 to Special Equipment specification, and fitted with the larger 3.8 litre engine. The XK has enjoyed a detailed restoration by a Dutch Jaguar specialist approximately 15 years ago, and has covered only 12,000 kilometres since. During the restoration and upgrade work the motor was uprated to a 4.2 litre E-Type unit featuring a lightened flywheel and electronic ignition, and now delivers a healthy 265bhp. The motor is cooled with an aluminum radiator and additional bonnet louvres. The transmission has been uprated to a 5-speed unit, and power steering has been added. Ride and handling have been improved with Koni shock absorbers all round, while the braking system has also been uprated. Finally the Jaguar was treated to a rare and desirable set of Borrani wire wheels on each corner.
Supplied with extensive history and invoices for works completed, this is an incredibly competent car for classic rallying or long distance touring holidays.