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jaguar / Spec Sheet / 24 Mar 2026

Jaguar XK120/140/150, Full Specifications

Last updated 24 Mar 2026

Production Overview

DetailXK120XK140XK150
Production years1948-19541954-19571957-1961
Body stylesOTS, DHC, FHCOTS, DHC, FHCOTS, DHC, FHC
ConstructionSteel body on box-section chassis (alloy body on ash frame for early cars)Steel body on box-section chassisSteel body on box-section chassis (FHC semi-monocoque)
DesignerSir William LyonsSir William LyonsSir William Lyons
Total production12,0789,0519,382

Engine Specifications

XK120

SpecificationStandardSpecial Equipment (SE)
TypeInline 6-cylinder, DOHCInline 6-cylinder, DOHC
Capacity3,442 cc3,442 cc
Bore x Stroke83.0 mm x 106.0 mm83.0 mm x 106.0 mm
Compression ratio8.0:18.0:1
Cylinder headB-typeB-type (high-lift cams)
CarburettorsTwin SU H6, 1.75-inchTwin SU H6, 1.75-inch
Power160 bhp @ 5,000 rpm180 bhp @ 5,300 rpm
Torque195 lb-ft @ 2,500 rpm203 lb-ft @ 2,500 rpm

XK140

SpecificationStandardSEC-Type Head
TypeInline 6-cylinder, DOHCInline 6-cylinder, DOHCInline 6-cylinder, DOHC
Capacity3,442 cc3,442 cc3,442 cc
Bore x Stroke83.0 mm x 106.0 mm83.0 mm x 106.0 mm83.0 mm x 106.0 mm
Compression ratio8.0:18.0:19.0:1
Cylinder headB-typeB-type (high-lift cams)C-type
CarburettorsTwin SU H6Twin SU H6Twin SU HD6
Power190 bhp @ 5,500 rpm190 bhp @ 5,500 rpm210 bhp @ 5,750 rpm
Torque210 lb-ft @ 2,500 rpm210 lb-ft @ 2,500 rpm213 lb-ft @ 3,000 rpm

XK150

SpecificationStandard 3.4SE 3.4S 3.4S 3.8
TypeInline 6, DOHCInline 6, DOHCInline 6, DOHCInline 6, DOHC
Capacity3,442 cc3,442 cc3,442 cc3,781 cc
Bore x Stroke83.0 x 106.0 mm83.0 x 106.0 mm83.0 x 106.0 mm87.0 x 106.0 mm
Compression8.0:19.0:19.0:19.0:1
Cylinder headB-typeC-typeStraight-portStraight-port
CarburettorsTwin SU HD6Twin SU HD6Triple SU HD8Triple SU HD8
Power190 bhp @ 5,500 rpm210 bhp @ 5,500 rpm250 bhp @ 5,500 rpm265 bhp @ 5,500 rpm
Torque210 lb-ft @ 3,000 rpm216 lb-ft @ 3,000 rpm240 lb-ft @ 4,000 rpm260 lb-ft @ 4,000 rpm

Common Engine Data (All Models)

SpecificationDetail
Valve trainTwin overhead camshafts, 2 valves per cylinder, chain-driven
Main bearings7
Oil capacity8.5 litres (with filter)
Coolant capacity14.2 litres
Fuel requirement97-98 RON (Super/Premium)

Transmission

Manual Gearbox (All Models)

SpecificationDetail
TypeMoss 4-speed manual
Synchromesh2nd, 3rd, 4th (1st is non-synchro)
OverdriveLaycock de Normanville (optional, XK140/150)
ClutchSingle dry plate, hydraulic operation

Automatic Gearbox (XK140/150 Optional)

SpecificationDetail
TypeBorg-Warner DG (XK140), Borg-Warner DG/Type 35 (XK150)
Speeds3-speed automatic

Chassis and Suspension

Frame

SpecificationXK120/140XK150
TypeBox-section steel chassis, separate bodyBox-section steel chassis (OTS/DHC), semi-monocoque (FHC)

Front Suspension

SpecificationXK120XK140XK150
TypeIndependent, double wishbonesIndependent, double wishbonesIndependent, double wishbones
SpringsTorsion barsTorsion barsTorsion bars
DampersTelescopic hydraulicTelescopic hydraulicTelescopic hydraulic
Anti-roll barOptionalStandardStandard
Steering typeRecirculating ballRack and pinionRack and pinion
Turns lock-to-lock2.752.752.75

Rear Suspension (All Models)

SpecificationDetail
TypeLive axle
SpringsSemi-elliptic leaf springs
DampersTelescopic hydraulic (lever arm on early XK120)
Axle ratio (standard)3.54:1
Axle ratio (optional)3.27:1, 3.77:1, 4.09:1

Brakes

SpecificationXK120XK140XK150
FrontDrums, 305 mm (12 in)Drums, 305 mm (12 in)Dunlop discs, 305 mm (12 in)
RearDrums, 305 mm (12 in)Drums, 305 mm (12 in)Dunlop discs, 279 mm (11 in)
ServoVacuum (optional)Vacuum (optional)Vacuum (standard)

Wheels and Tyres

SpecificationXK120XK140XK150
Standard wheels54-spoke wire, 5J x 16Pressed steel disc, 5J x 16Pressed steel disc, 5J x 15 (or 16)
Optional wheelsPressed steel disc54-spoke wire54-spoke wire
Tyre size (original)6.00 x 16 crossply6.00 x 16 crossply6.00 x 16 crossply
Tyre size (modern)185VR16 radial185VR16 radial185VR16 or 185/80R15

Dimensions

MeasurementXK120XK140XK150
Overall length4,420 mm (174 in)4,470 mm (176 in)4,496 mm (177 in)
Overall width1,562 mm (61.5 in)1,638 mm (64.5 in)1,664 mm (65.5 in)
Overall height (OTS)1,321 mm (52.0 in)1,346 mm (53.0 in)1,372 mm (54.0 in)
Wheelbase2,591 mm (102 in)2,591 mm (102 in)2,591 mm (102 in)
Front track1,295 mm (51.0 in)1,311 mm (51.6 in)1,318 mm (51.9 in)
Rear track1,270 mm (50.0 in)1,270 mm (50.0 in)1,270 mm (50.0 in)

Weights

ModelKerb Weight (approx.)
XK120 OTS (alloy)1,198 kg (2,640 lb)
XK120 OTS (steel)1,293 kg (2,850 lb)
XK120 FHC1,315 kg (2,900 lb)
XK140 OTS1,315 kg (2,900 lb)
XK140 FHC1,361 kg (3,000 lb)
XK150 OTS1,338 kg (2,950 lb)
XK150 FHC1,384 kg (3,050 lb)
XK150S 3.8 OTS1,338 kg (2,950 lb)

Performance

XK120

MetricStandardSE
Top speed193 km/h (120 mph)201 km/h (125 mph)
0-60 mph10.0 sec9.2 sec
0-100 km/h10.5 sec9.7 sec
Standing 1/4 mile17.5 sec17.0 sec
Fuel consumption14-18 L/100km15-19 L/100km

XK140

MetricStandardC-Type Head
Top speed196 km/h (122 mph)210 km/h (130 mph)
0-60 mph9.5 sec8.4 sec
0-100 km/h10.0 sec8.9 sec
Standing 1/4 mile17.0 sec16.2 sec
Fuel consumption14-18 L/100km15-20 L/100km

XK150

MetricStandard 3.4S 3.4S 3.8
Top speed199 km/h (124 mph)214 km/h (133 mph)219 km/h (136 mph)
0-60 mph9.0 sec7.8 sec7.3 sec
0-100 km/h9.5 sec8.3 sec7.8 sec
Standing 1/4 mile16.8 sec15.7 sec15.3 sec
Fuel consumption14-18 L/100km16-21 L/100km17-22 L/100km

Electrical System

SpecificationXK120XK140XK150
Voltage12V12V12V
Earth polarityPositive earthPositive earthPositive earth
GeneratorLucas C39 dynamoLucas C39/C42 dynamoLucas C42 dynamo
Battery12V, 51Ah12V, 57Ah12V, 57Ah
Headlights7-inch sealed beam7-inch sealed beam7-inch sealed beam

Fuel System

SpecificationXK120XK140XK150XK150S
Tank capacity60.5 L (13.3 gal)60.5 L (13.3 gal)60.5 L (13.3 gal)60.5 L (13.3 gal)
Fuel pumpSU electricSU electricSU electricSU electric
CarburettorsTwin SU H6Twin SU H6Twin SU HD6Triple SU HD8

Production Numbers by Body Style

XK120 (1948-1954)

Body StyleLHDRHDTotal
OTS (Roadster)6,4371,1947,631
DHC (Drophead Coupe)1,3674021,769
FHC (Fixed Head Coupe)2,0326462,678
Total9,8362,24212,078

XK140 (1954-1957)

Body StyleLHDRHDTotal
OTS (Roadster)2,7406143,354
DHC (Drophead Coupe)2,3615282,889
FHC (Fixed Head Coupe)1,9658432,808
Total7,0661,9859,051

XK150 (1957-1961)

Body StyleLHDRHDTotal
OTS (Roadster)1,7205452,265
DHC (Drophead Coupe)1,9037692,672
FHC (Fixed Head Coupe)3,0791,3664,445
Total6,7022,6809,382

Identification

Chassis Number Prefixes

PrefixModel
66xxxxXK120 OTS
67xxxxXK120 FHC
68xxxxXK120 DHC
8xxxxxXK140 (various suffixes for body style)
S/T xxxxxXK150 (S = OTS/DHC, T = FHC)

Engine Number Prefixes

PrefixApplication
WXK120
GXK140
V/VA/VAS/VSXK150 (various tunes)
// RELATED GUIDES

Jaguar XK120/140/150, The Complete Buying Guide

Buying Guide

Jaguar XK120/140/150, Known Issues and Common Problems

Common Problems

Jaguar XK120/140/150, Frequently Asked Questions

FAQ

Jaguar XK120/140/150, Complete History

History
// COMMENTS

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