Jaguar XK120/140/150
The car that put postwar Jaguar on the map as a genuine sports car maker.
Unveiled as a show car in 1948, the XK120's beauty and genuine 120 mph top speed (hence the name) generated such demand that Jaguar rushed it into production. It established the twin-cam XK engine that would power Jaguars for the next three decades.
History
The XK120 (1948–1954) was offered as a roadster, fixed-head coupe, and drophead coupe, powered by the new 3.4-liter twin-cam XK engine. Early cars used aluminum body panels before Jaguar switched to steel for volume production.
The XK140 (1954–1957) added rack-and-pinion steering, more interior and luggage space, and an optional overdrive transmission — real usability improvements over the 120.
The XK150 (1957–1961) widened the body, added disc brakes as standard, and culminated in the 3.8-liter "S" variant producing 265 hp — the fastest and most capable XK of all.
Notable Versions
XK120 Alloy Roadster
Early aluminum-bodied cars built before the switch to steel. Rare and highly valued.
XK150S 3.8
The most powerful XK, with triple SU carburetors and 265 hp.
Special Equipment (SE)
Higher-output engine and additional trim, available across the range.
What to Look for When Buying
Key inspection points from experienced collectors.
Inspect steel body panels and structure for rust
Steel-bodied cars (post-alloy production) rust extensively — check sills, floors, and door bottoms carefully.
Verify the engine block matches chassis records
Jaguar Heritage can confirm original specification against chassis number — essential for value on any XK.
Check wire wheel spline condition if equipped
Worn splines are a safety issue as well as a costly repair.
Watch for timing chain tensioner wear
A known XK engine wear point — listen for chain noise on cold start.
Panel gaps reveal restoration quality
Inconsistent gaps or poor paint match usually indicate a lower-quality prior restoration.
Quick Specs
- Engine
- 3.4L–3.8L DOHC I6
- Horsepower
- 160–265 hp (150S)
- Wheelbase
- 102 in
- Transmission
- 4-speed manual, overdrive optional
Market Price Guide
Approximate USA asking prices
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