Jaguar XK140: the XK120 finished properly (1954–1957)

The Jaguar XK140 is the XK120 its owners had been asking for all along: the sensational original with its two genuine flaws, heavy steering and a cramped cockpit, engineered away, and nothing that mattered touched. Built from 1954 to 1957, it is the middle child of the XK family and, whisper it among the purists, the best of them to actually drive.

What changed, and why it worked

Jaguar moved the 3.4-litre XK engine three inches forward, which sounds like nothing and transformed the car: real legroom at last, and space behind the seats of the closed cars for luggage or brave children. The steering became rack-and-pinion, borrowed in principle from the C-type racers, replacing the 120’s heavy recirculating-ball arrangement, and it remains the single biggest reason the 140 feels a generation more modern than its looks. Power rose to 190 bhp, cooling improved, and the bumpers grew into proper armour for a car that lived on real streets. The price of progress was subtle: a heavier one-piece grille and those bumpers thickened the 120’s jewel-like face a little, which is the whole case against the 140 and, at today’s prices, the buyer’s opportunity.

Roadster, drophead, fixed head

The open two-seater kept the sporting purity, side screens and all, and tops the market now as it always has. The drophead coupe added a proper lined convertible hood and wind-up windows, the civilised middle way. The fixed head coupe, its roofline stretched gracefully over that extra cabin space, is the value entry and arguably the best-looking closed XK of all. Around 8,900 cars were built across the three styles, the great majority left-hand drive for America, which makes honest UK-supplied right-hand-drive cars the scarce prize.

SE and the C-type head

The Special Equipment package is the specification to hunt: the C-type cylinder head, developed on the Le Mans-winning racers, took power to around 210 bhp and suits the car’s long-legged character perfectly. Wire wheels and twin exhausts usually came with it. SE cars dominate survivors, but a premium invites imitation, so the head’s provenance deserves the same scrutiny as the chassis number on any car traded as a genuine 210 bhp example.

What an XK140 is like to drive

The 140 is the XK that flatters. The rack-and-pinion steering gives it precision the 120 never had, the torquey 3.4 pulls from nothing with that unmistakable twin-cam snarl, and the ride suits British roads better than most of its 1950s exotica rivals. It is a genuine 100 mph-plus grand tourer that a competent owner can drive hard today, and the overdrive-equipped cars cruise motorways with surprising composure. Drum brakes are the period limit: they work, with planning, and they are the strongest argument the XK150 makes for itself.

The middle child’s market

The XK140 has spent decades as the family’s value pick, priced below the XK120 that made the legend and level with or below the disc-braked 150, and the logic has never quite been fair. The 120’s premium rewards purity and firsts; the 140 answers with the better steering, the roomier cabin and the same engine with more power, which is why owners who drive their cars so often end up in one. The full record, 451 recorded sales by body, why the drophead uniquely outsells the roadster here, and what the market has done since 2017, is on the page covering Jaguar XK140 values; the 140 remains the family’s strongest answer to the only question that matters at this level: which one would you actually use?

Buying a Jaguar XK140 today

Documentation carries unusual weight on these cars because so many crossed the Atlantic twice: exported new, repatriated decades later, and restored somewhere along the way to standards that vary from concours to cosmetic.

Structure first, always: sills, floors, chassis outriggers and the front-wing inner structure rot expensively, and at six-figure restoration costs a sound car is worth almost any premium over a project. Matching numbers matter to value; so does body-style honesty, since more than one fixed head has become a “roadster” over the decades. Mechanical parts supply is outstanding for the XK engine, the specialist network is deep on both sides of the Atlantic, and there is nothing on the car a good marque restorer has not rebuilt a hundred times. Values run from around £40,000 usable to £100,000 for the best, roadsters on top, with the Jaguar silo’s usual rule in full force: buy the history file as much as the car. For the wider era, see the sports cars of the 1950s, where the XK140 still sets the standard the others are measured against.

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