CARCARETOOL VEHICLE GUIDE

Humber Imperial

Humber Imperial — 1955–1956, 2-door newport hardtop (1955)4-door sedan4-door limousine2-door southampton hardtop (1956)4-door southampton hardtop (1956), 331 cuin Hemi V8354 cuin Hemi V8. Explore engine specifications, fuel economy, dimensions, tire sizes, seating, maintenance and tire-pressure guidance.

Engine331 cuin Hemi V8354 cuin Hemi V8

Transmission2-speed PowerFlite automatic (1955)3-speed TorqueFlite A488 automatic (1956)

About the Humber Imperial

Humber Imperial is a 2-door Newport hardtop (1955)4-door sedan4-door Limousine2-door Southampton hardtop (1956)4-door Southampton hardtop (1956) in the hatchback class, with source data covering 1955–1956. The available vehicle data lists 331 cuin Hemi V8354 cuin Hemi V8 as an engine configuration, paired with 2-speed PowerFlite automatic (1955)3-speed TorqueFlite A488 automatic (1956). Public source material describes the model in the context of its design, market positioning and vehicle history.

This Humber Imperial guide focuses on the details drivers commonly want to know, including engine information for 331 cuin Hemi V8354 cuin Hemi V8 and 2-speed PowerFlite automatic (1955)3-speed TorqueFlite A488 automatic (1956) transmission information. Exact specifications should be matched to the relevant model year and market.

Humber Imperial specifications at a glance

Use this table for the model-level essentials. Exact figures may vary by year, trim, engine and market.

Make	Humber
Model	Imperial
Model years	1955–1956
Body style	2-door Newport hardtop (1955)4-door sedan4-door Limousine2-door Southampton hardtop (1956)4-door Southampton hardtop (1956)
Vehicle class	hatchback
Manufacturer	Humber
Market / country	GB, NL, NZ

Engine, transmission and performance

Engine information for the Humber Imperial includes 331 cuin Hemi V8354 cuin Hemi V8.. Transmission information includes 2-speed PowerFlite automatic (1955)3-speed TorqueFlite A488 automatic (1956).

Engine	331 cuin Hemi V8354 cuin Hemi V8
Transmission	2-speed PowerFlite automatic (1955)3-speed TorqueFlite A488 automatic (1956)

Dimensions, weight and practicality

Dimensions and capacity figures are presented as published source data when available.

Wheelbase	1955:130.0 in (3,302 mm)1956:133.0 in (3,378 mm)
Length	1955: 223.0 in (5,664 mm)1956: 229.6 in (5,832 mm)
Width	1955: 79.1 in (2,009 mm)1956: 78.8 in (2,002 mm)
Height	1955: 61.2 in (1,554 mm)1956: 61.5 in (1,562 mm)
Kerb / curb weight	4700 –

Humber Imperial other specifications

Name	First generation (C-69, C-70)
Image	1955_Chrysler_Imperial_(5962616724).jpg
Caption	1955 Imperial Four Door Sedan

Humber Imperial generations and model years

Where a source covers multiple generations, CarCareTool selects the generation(s) that best match this catalog model instead of mixing unrelated variants.

Generation / scope	Years	Engine	Transmission	Drivetrain
First generation (C-69, C-70)	1955–1956	331 cuin Hemi V8354 cuin Hemi V8	2-speed PowerFlite automatic (1955)3-speed TorqueFlite A488 automatic (1956)	Not specified

Humber Imperial features and equipment

Features shown below are tied to the available source material for this model. Equipment can vary by year, trim and market.

Standard or documented features

✓With an extra 19.5 in (495 mm) and 16.5 in (419 mm) of wheelbase in 1955 and 1956 respectively, and seating eight (three in the front including the driver, three in the rear, and two on rearward-facing fold-down jump seats), these replaced the long-wheelbase offerings in all Chrysler marques

✓Throughout her husband's term as U.S

TIRE PRESSURE

Recommended tire pressure for Humber Imperial

Check the vehicle placard or owner’s manual for the manufacturer’s cold inflation pressure. CarCareTool estimates are clearly labelled when an exact verified value is unavailable.

Normal load32 PSI front30 PSI rear

Fully loaded34 PSI front33 PSI rear

Load condition	Front	Rear	Status
Normal	32 PSI	30 PSI	Estimate
Fully loaded	34 PSI	33 PSI	Estimate

Calculate how much air to add

Frequently asked questions about Humber Imperial

These FAQs are generated automatically for this specific vehicle from the specifications, features and ownership data available in CarCareTool. Questions are selected by relevance so the page focuses on details that can actually be answered for this model.

What engine does the Humber Imperial have?

The available source data lists the Humber Imperial engine as 331 cuin Hemi V8354 cuin Hemi V8. Engine availability can differ by model year and market.

What tire pressure should I use for the Humber Imperial?

For the correct setting, use the cold inflation pressure on the vehicle placard or in the owner’s manual. When CarCareTool does not have a verified configuration-specific value, its starting estimate is 32 PSI front and 30 PSI rear for normal load. This is an estimate, not an OEM recommendation.

What is the best engine oil for the Humber Imperial?

There is no single best engine oil for every Humber Imperial configuration. Use the viscosity grade and manufacturer approval specified for the exact engine in the owner’s manual.

What body style is the Humber Imperial?

The Humber Imperial is classified as a 2-door Newport hardtop (1955)4-door sedan4-door Limousine2-door Southampton hardtop (1956)4-door Southampton hardtop (1956).

What years was the Humber Imperial produced?

The available vehicle record places the Humber Imperial in the 1955–1956 period. Exact availability can vary by market.

What are the dimensions of the Humber Imperial?

The available source data lists length 1955: 223.0 in (5,664 mm)1956: 229.6 in (5,832 mm), width 1955: 79.1 in (2,009 mm)1956: 78.8 in (2,002 mm), height 1955: 61.2 in (1,554 mm)1956: 61.5 in (1,562 mm), and wheelbase 1955:130.0 in (3,302 mm)1956:133.0 in (3,378 mm).

What transmission does the Humber Imperial have?

The available source data lists 2-speed PowerFlite automatic (1955)3-speed TorqueFlite A488 automatic (1956) transmission options for the Humber Imperial.

Who makes the Humber Imperial?

The manufacturer listed for the Humber Imperial is Humber.

How much does the Humber Imperial weigh?

The available source data lists a kerb/curb weight of 4700 –. Actual weight can vary with engine, trim and equipment.

Where was the Humber Imperial built?

The available source record lists assembly information as United States: Detroit, Michigan (Jefferson Avenue Assembly).

What class of car is the Humber Imperial?

The Humber Imperial is listed in the hatchback class.

Which markets or countries sold the Humber Imperial?

The CarCareTool catalog currently associates the Humber Imperial with GB, NL, NZ. Market availability and specifications can differ.

What cars are related to the Humber Imperial?

The available source data identifies related models as Imperial Parade Phaeton Hongqi CA72 Facel Vega Excellence. Relationships can vary by market and generation.

How often should I check the tire pressure on the Humber Imperial?

Check the tires regularly and before long trips, with the tires cold. Use the vehicle placard or owner’s manual as the source of the manufacturer’s recommended pressure.

Should I use the tire sidewall pressure for the Humber Imperial?

No. The maximum pressure printed on the tire sidewall is not automatically the vehicle’s recommended setting. Use the vehicle placard or owner’s manual for the correct cold inflation pressure.

Does the recommended tire pressure change when the Humber Imperial is fully loaded?

It can. Many vehicles specify a different cold pressure for heavier loads. Check the vehicle placard or owner’s manual for the exact loading condition.

Can the Humber Imperial have different tire pressures front and rear?

Yes. Some vehicles specify different front and rear pressures because axle loads and vehicle configurations differ. Follow the exact vehicle recommendation where available.

Why can mileage differ from the published figure for the Humber Imperial?

Published fuel economy is measured under a defined test method. Real-world mileage can vary with traffic, speed, temperature, tire pressure, payload, maintenance and driving style.

Data sources and verification are available in the page editor; exact specifications can vary by year, market, trim and engine.

Humber Imperial images

Vehicle images are shown from the stored source image records when available.