Background
Unveiled at the London Motor Show in October of 1966, the Jaguar 420G was a continuation of the Mark X, which was sold between 1961 and 1966.
Not to be confused with the smaller Jaguar 420 Saloon based on the S-Type, the ‘G’ featured numerous small aesthetic changes compared with the MK X, including a redesigned front grille with a vertical bar, side indicators on the front wings, and a chrome strip along the side, though this was often omitted from two-tone paint cars in order to ‘clean-up’ the appearance.
Mechanically, the 420G - the ‘G’ apparently means ‘Grand’ - was virtually identical to the Mark X, retaining the XK inline-six engine which, from 1966, had expanded in capacity to 4.2-litres.
One perhaps unsurprising fact about the enormous Mark X/420G is that it was the largest car Jaguar built in the 20th century, with only the X350 XJ of 2003-2009 coming remotely close to its proportions in the 21st century.







