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 After 1967, the 420G was effectively withdrawn from the U.S. market (though it continued overseas until about 1970), leaving Jaguar without a prestige offering until the arrival of the XJ6, which replaced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
- Lovely XK engine
- 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:
Type Size Horsepower Years dohc I-6 (258)
4235 265 1965-1970
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