1965-1970 Jaguar Mark X & 420G were continuations of Jaguar's larger sedan, now with the larger 4.2-liter version of the faithful dohc six specified for the E-Type beginning in 1965.

Though a manual gearbox was available, most of these cars had Borg-Warner's three-speed automatic. The standard power steering system was also revised. There were no visual changes compared to the "Series 1" Mark X. The result was a more torquey and flexible limousine-like Jaguar.

The model was renamed 420G beginning in 1967 to bring nomenclature into line with that of the smaller 240/340/420 sedans based on the Mark II platform.

Appearance changes were confined to thin chrome side moldings and a more formal upright grille. After 1967, the 420G was effectively withdrawn from the U.S. market (though it continued overseas until about 1970), leaving Jaguar without a prestige offering until the arrival of the XJ6, which replaced both the Mark X and the compact S-Type/420 series.

Pluses of the 1965-1970 Jaguar Mark X & 420G :

  • Roomy, comfortable highway car
  • Nice blend of modern and traditional styling
  • Lovely XK engine
  • Well-equipped
  • Handling (despite size)
  • Not too costly to buy
  • Greater low-end torque for easier city driving
  • Mark X a Milestone car

Minuses of the 1965-1970 Jaguar Mark X & 420G:

  • Rusts easily
  • Trim and body parts in short supply
  • Poor mileage
  • Underpowered for give-and-take traffic
  • May be too large for some
  • Depreciating lately, to virtual bargain status

Production of the 1965-1970 Jaguar Mark X & 420G:

  • Mark X: 5,680
  • 420G: 5,554

Specifications of the 1965-1970 Jaguar Mark X & 420G:
Length, inches: 202.0
Wheelbase, inches: 120.0
Weight, pounds: 4,300
Price, new: N/A

Engines for the 1965-1970 Jaguar Mark X & 420G:

TypeSize
Horsepower
Years
dohc I-6 (258) 4235 265 1965-1970

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