Jaguar 420 classic cars for sale

History of the Jaguar 420

The Jaguar 420 debuted at the London Motor Show in October 1966 as a further development of the S-Type, positioned above it in Jaguar's saloon range. It marked the culmination of Jaguar's 'compact sporting saloons' of the 1960s, sharing its wheelbase but featuring an extended front end to accommodate the larger XK six-cylinder engine. The 420 was developed in parallel with the Daimler Sovereign and both models were sold until late 1968, when the launch of the XJ6 ushered in a new era. The 420 offered improved braking performance and a more precise power steering system compared to its predecessors, and ended up becoming a reference point for the combination of elegance, comfort, and road capability.

Model History

Produced from 1966 to 1968, the Jaguar 420 was conceived as a bridge between the compact Mark II and the technically advanced Mark X. The 420 technically eclipsed the S-Type with its refined engineering that emphasised both luxury and dynamic driving. Over its brief two-year production run, Jaguar built 9,801 units, with the vast majority destined for right-hand drive markets. The model was supplanted by the all-new Jaguar XJ6 in 1968—which would go on to define the next decades of Jaguar saloons.

Highlights and Special Features

With a 4.2-litre straight-six producing up to 248 PS (245 hp) and 382 Nm of torque, the 420 manages 0–100 km/h acceleration that remains respectable today and reaches a top speed near 200 km/h. The standard four-speed manual gearbox (with optional overdrive) or a three-speed automatic from BorgWarner provided versatile touring ability. Distinct upgrades over the S-Type include larger brakes and significantly improved power steering. Inside, the cabin is furnished with Connolly leather, polished wood trim, and substantial soundproofing—its refinement and road manners are underscored by classic wire wheels and the frequent use of whitewall tyres.

Statistics

Based on listing data, the 420 holds 100% of supply and demand in this model code for classic Jaguars, highlighting its unique presence and specialised market appeal among enthusiasts and collectors.

Technical Data

Special Editions and Variants

The Daimler Sovereign, essentially the sister model to the 420, is the closest variant, distinguished mainly by branding and trim. Factory-fitted options like electric sunroofs and original Blaupunkt radios make certain cars especially desirable to collectors, particularly those retaining full factory tool kits or rare colour combinations.

Weak Spots and Common Issues

Bodies and chassis from this era are susceptible to corrosion, particularly in the sills, floorpans, and wheel arches. Mechanical parts—especially the XK engine’s cooling system and SU carburettors—require diligent, regular attention. Braking and power steering systems, while robust for their time, should be scrutinised for leaks or wear. Unrestored interiors may show wear on Connolly leather, wood trim, and electrical accessories.

Engine, Transmission, and Driving Dynamics

The Jaguar 420’s 4.2-litre straight-six delivers smooth power, ample torque, and refined cruising. The manual transmission (with optional overdrive) and automatic ensure flexibility for both spirited and relaxed driving. The independent suspension and robust disc brakes grant commendable road-holding and braking for a saloon of this era, with a ride that balances comfort with nimble handling. Most sought-after examples are late-production 420s with the manual overdrive gearbox, full Connolly leather, factory wire wheels, and preserved matching numbers. Cars in original colours with dealer-fitted options like electric sunroofs or upgraded radios also attract significant attention.

Interior, Comfort, Exterior and Design

The 420’s silhouette is unmistakable, defined by its extended nose and upright haunches, a result of blending the Mark II’s elegance with the mechanical command of the Mark X. Interiors feature vast expanses of real wood veneer, Connolly leather across all seating and trim, and dense wool carpeting. Classic wire wheels, optional fog lamps, and factory-fitted electric antennas are often seen. Many cars came with rare interior options like electrically operated sunroofs or dealer-fitment sound systems. Attention to detail in fit and finish, along with extra insulation, makes the 420 stand out for refinement in its class.

Other features

Boots were frequently equipped with factory-fitted toolkits, and many cars retain original equipment such as Blaupunkt radios and Lucas fog lamps. Jaguar’s focus on luxury extended to deep boot carpeting and the use of high-grade interior leather well beyond the standard of its era.

Summary

The Jaguar 420 delivers a thoroughbred blend of British engineering, performance, and luxury. Produced in limited numbers and representing the peak of Jaguar's 1960s saloon evolution, the 420 stands out with its balance of sporting ability and grand touring comfort, all in a package immediately recognisable as a product of Coventry’s golden era.