The data lists one generation and one named version, so the buying guide is built around that version’s measured numbers—power per litre, weight per horsepower, and every field that is not measured.
The Jaguar 420 was sold in 1 generation (1966–1968) as a Sedan, with 1 catalogue version: 4.2 MT. There is no second engine, no automatic, no restyle year, and no later generation in this dataset, so a buyer is not choosing between trims. The decision is whether 4.2 MT matches the numbers you need: 245 hp, 384 Nm, 4200 cc Gasoline, Manual 4, RWD, kerb 1695 kg.
The data lists one generation and one named version, so the buying guide is built around that version’s measured numbers—power per litre, weight per horsepower, and every field that is not measured.
# Jaguar 420: which version to buy
The Jaguar 420 was sold in 1 generation (1966–1968) as a Sedan, with 1 catalogue version: 4.2 MT. There is no second engine, no automatic, no restyle year, and no later generation in this dataset, so a buyer is not choosing between trims. The decision is whether 4.2 MT matches the numbers you need: 245 hp, 384 Nm, 4200 cc Gasoline, Manual 4, RWD, kerb 1695 kg. Acceleration, top speed, fuel use, tank, clearance, wheels, and gross weight are not measured.
Jaguar 420 generations: what changed (and what did not)
1 generation (1966-01-01 to 1968-12-31) is the only generation. Body: Sedan. Versions in this generation: 1 (4.2 MT). There is no restyling block in the data, so there is no “facelift vs pre-facelift” split and no 1st-generation repeat. Years of the generation and of 4.2 MT are the same: 1966–1968. A later Jaguar with a similar name is not this model in these figures.
Because generation count is 1, generation-to-generation arithmetic is empty: no extra horsepower, no extra kilogram, no extra litre of displacement versus a predecessor or successor in this file.
Jaguar 420 specs and engine: the only version, named exactly
| Version | hp | Nm | Displacement (cc) | Fuel | Cylinders | Layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|---|
| 4.2 MT | 245 | 384 | 4200 | Gasoline | 6 | Inline | not measured | Manual 4 | RWD |
4.2 MT engine placement: Front, longitudinal. Induction: Carburetor. Compression: 8. Bore × stroke: 92 x 106. Fuel grade in the data: 92. Peak power 245 hp (180 kW) at 5500 rpm. Peak torque 384 Nm at 3750 rpm. Valves per cylinder: not measured. Boost: not measured.
Power per litre for 4.2 MT: 245 ÷ 4.2 = 58.3 hp per litre (4200 cc = 4.2 litres). Torque per litre: 384 ÷ 4.2 = 91.4 Nm per litre. Those ratios are the whole powertrain story in this catalogue: there is no second displacement to compare.
Front brakes Disc, rear brakes Disc. Front suspension Independent, spring. Rear suspension not measured.
Performance, mpg, and economy: what is not measured
For 4.2 MT:
- 0–100: not measured
- Top speed: not measured
- City consumption: not measured
- Highway consumption: not measured
- Combined consumption: not measured
- CO2: not measured
- Eco class: not measured
A mpg or “which 420 is quicker” ranking cannot be built from this file. The only performance-adjacent numbers that are measured are 245 hp, 384 Nm, engine speed of those peaks, and kerb 1695 kg.
Weight per horsepower for 4.2 MT: 1695 ÷ 245 = 6.92 kg per hp. Horsepower per tonne of kerb weight: 245 ÷ 1.695 = 144.5 hp per tonne. Those two figures are arithmetic on the given kerb and power; they are not a substitute for a 0–100 time.
Dimensions, weight, tank, and wheels
- Kerb weight 4.2 MT: 1695 kg
- Gross weight: not measured
- Ground clearance: not measured
- Fuel tank: not measured
- Wheel size: not measured
Payload (gross minus kerb) cannot be calculated: gross is not measured. Range cannot be calculated: tank and consumption are not measured. If you need a known tank, known wheels, or a known clearance, this catalogue does not supply them for 4.2 MT.
Problems and reliability
This dataset has no failure rates, no service intervals, and no problem lists. Reliability for Jaguar 420 4.2 MT is not measured here. What is measured and relevant to upkeep is the hardware type: Gasoline, Carburetor, compression 8, Manual 4, RWD, Front, longitudinal, 6 Inline. None of those labels is a reliability score.
Which version to buy and why
There is 1 version: 4.2 MT. “Which version” is not a fork between two Jaguar 420 lines; it is a yes/no on this specification.
Buy 4.2 MT if the measured package is the point. You get 245 hp at 5500 rpm and 384 Nm at 3750 rpm from 4200 cc Gasoline, 6 Inline, Carburetor, compression 8, Front, longitudinal. You get Manual with 4 gears and RWD. You get disc brakes at both ends (Disc / Disc), independent spring front suspension, and 1695 kg kerb. Specific output is 58.3 hp/l; mass per horsepower is 6.92 kg/hp. Production window is 1966–1968, Sedan, 1 generation.
Do not treat missing rows as if they were optional extras. 0–100, top speed, mpg (city/highway/combined), tank, CO2, eco class, gross weight, clearance, wheels, boost, valves per cylinder, and rear suspension are not measured. Extra money cannot be mapped to extra equipment in this file: there is no second price and no second spec sheet.
There is no “more powerful 4.2 MT” and no “weaker 4.2 MT”. Duplicate names distinguished by horsepower do not appear. Cylinder count is 6, layout is Inline — both from the data, not from a nickname.
Generation choice is also closed. 1 generation only; 4.2 MT years match the generation years. Nothing in the numbers shows a later 420 that gained displacement, gears, or drive type.
Arithmetic recap for 4.2 MT (all from given figures): 245 hp; 180 kW; 384 Nm; 4200 cc; 58.3 hp/l; 91.4 Nm/l; 1695 kg; 6.92 kg/hp; 144.5 hp/tonne; 4 Manual gears; RWD; 1 body (Sedan); 1 generation; 1 version. Fuel 92. Compression 8. Bore × stroke 92 x 106. Power rpm 5500. Torque rpm 3750.
If a catalogue page must pick a single anchor for the model, that anchor is 4.2 MT — the only named version, and the only set of measured engine, gearbox, drive, brake, and kerb figures in the data.