Not be confused with the smaller Jaguar 420. In October 1966 the Jaguar Mark X was renamed the 420G.The 420G is a gentle evolution of the MkX, with differences confined to the bigger 4.2-litre straight-six replacing the previous 3.8-litre in MkX; a chrome strip down each flank; a larger front grille with a vertical central bar splitting it in two; and side indicator repeaters added to each front wing.
The MkX, launched in 1961, looked absolutely enormous, with plenty of room for six large passengers. The 420G was practically a limo fitted with the hottest sports car engine. In fact, a version was available, on the standard wheelbase, with a dividing glass screen partition and front bench seat replacing the separate seats of standard cars. Only 5,763 units sold. (classicandperformancecar.com)
waimakclassiccars.co.nz, brookfield-classics.co.uk & autobild.de)