420G

From 1968 to 1971

In 1968 the Mark 10 was re-badged as the 420G with a modicum of trim changes like new chromed hub caps, a bold centre rib in the radiator grille and some interior trim changes. The model, although running alongside the all new XJ6 when introduced in 1968, was finally dropped from the range in 1971.

Model Summary

Model Type:

Mark 10/420G/DS420

Production Dates:

1968 - 1971

Engine Range:

3.8 Litre Saloon

4.2 Litre Saloon

0 - 60 mph:

3.8 Litre Saloon - 9.1 seconds

4.2 Litre Saloon - 9.9 seconds

Top Speed:

3.8 Litre Saloon - 119.5 mph

4.2 Litre Saloon - 121.5 mph

420G Technical Specifications

Technical Information

Engine Statistics

  3.8 Litre Saloon
Engine (cc) 3781
Bore and Stroke (mm) 87 x 106
Compression Ratio 8:1 (7:1/9:1 optional)
BHP 265
@ RPM 5500
Torque (lb ft) 260
@ RPM 4000
Fuelling 3x SU carbs
  4.2 Litre Saloon
Engine (cc) 4235
Bore and Stroke (mm) 92.07 x 106
Compression Ratio 8:1 (7:1/9:1 optional)
BHP 265
@ RPM 5400
Torque (lb ft) 283
@ RPM 4000
Fuelling 3x SU carbs

Engine Performance

  3.8 Litre Saloon
Top Speed 119.5 mph
0 - 60 mph 9.1 seconds
Fuel Consumption 14.1 mpg
  4.2 Litre Saloon
Top Speed 121.5 mph
0 - 60 mph 9.9 seconds
Fuel Consumption 14.5 mpg

Model Specifications

  3.8 Litre Saloon
Transmission 4-speed (3 synchro) BW 3-speed auto
Wheel Size (in) 14, steel
Suspension (Front) Ind semi-trailing wishbones, coil springs, anti-roll bar
Suspension (Rear) Ind lower wishbone/upper driveshaft link, radius arms, coil springs
Brakes 4-wheel disc, rear inboard
  4.2 Litre Saloon
Transmission 4-speed (3 synchro) BW 3-speed auto
Wheel Size (in) 14, steel
Suspension (Front) Ind semi-trailing wishbones, coil springs, anti-roll bar
Suspension (Rear) Ind lower wishbone/upper driveshaft link, radius arms, coil springs
Brakes 4-wheel disc, rear inboard

Model Dimensions

  3.8 Litre Saloon
Length (in) 202
Width (in) 76
Height (in) 54.75
Wheelbase (in) 120
Front Track (in) 58
Rear Track (in) 58
Weight (Cwt) 37
  4.2 Litre Saloon
Length (in) 202
Width (in) 76
Height (in) 54.75
Wheelbase (in) 120
Front Track (in) 58
Rear Track (in) 58
Weight (Cwt) 37

Optional Extras

  • Choice of three radio installations with or without rear parcel shelf-mounted speaker
  • Electric radio aerial
  • Wind-up radio aerial
  • Electrically operated windows (front and rear)
  • Laminated windscreen
  • Witter tow bar
  • Heated rear screen (earlier cars)
  • Front seat belts
  • Choice of radial, town and country, or whitewall tyres
  • Borg Warner automatic transmission
  • Overdrive (for non-overdrive-equipped manual transmission cars)
  • Fire extinguisher
  • Sundym tinted windscreen and side windows
  • Wing mirrors
  • Integrated ignition/starter switch to steering column
  • Limousine appointments (only available on ordering a new car)

420G Events

Mark Russell And Mark Gordon Cg

A day of classic racing at one of the best circuits in the UK. Join hundreds of car clubs and displays as well as get up close to racing legends.

A day of classic racing at one of the best circuits in the UK. Join hundreds of car clubs and displays as well as get up close to racing legends.

S Type Sport

20th October this year marks 20 years exactly since the launch of the Jaguar S-TYPE at the NEC Motor Show. JEC members are invited to a celebration of the model at Jaguar Works where we will have a line-up of S-type and free tours of the Works Fa...

20th October this year marks 20 years exactly since the launch of the Jaguar S-TYPE at the NEC Motor Show. JEC members are invited to a celebratio...

Club News

Video Banner

We are very proud of our Jaguar Summer Festival 2018 at Wroxall Abbey. What better way to enjoy the event with a video recap....

We are very proud of our Jaguar Summer Festival 2018 at Wroxall Abbey. What better way to enjoy the event with a video recap....

Brands2

​Continuing our successful formula of providing an informal track day experience to our members and beyond we are returning to the famous track, Castle Combe in Wiltshire.

​Continuing our successful formula of providing an informal track day experience to our members and beyond we are returning to the famous track, Castle Combe in Wiltshire.

Need a manual or Buyers Guide for this model?

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If you would prefer to talk to a team member - call 0117 969 8186