NO LONGER AVAILABLE Listing ended Oct 5, 2026

1978 MG MGB

$5,995

Vehicle Details

Make

Model

MGB

Year

1978

Mileage

100,500 miles

VIN

AMS34835

Body Type

Convertible

Transmission

Manual

Fuel Type

Gasoline

Description

1978 MGB with solid body. New floor, new tires, rims painted, new carpet, new door panels and toppers, new battery, total new floor, Weber carb and fuel pressure regulator (an expensive upgrade), electronic ignition. New convertible top with zip down window, and top boot.

Radiator recently cleaned and flushed. Sale includes spare engine, transmission, radiator, and other accessories. Needs seats rebuilt - foam and upholstery. Transmission pops out of reverse. Fun to drive and, like most MGBs, fun to work on.

Classic MG MGB Buyer's Guide (1962–1980)

Full guide

Emily Chen

JDM Classics

1962–1980

~5 min read

Updated Apr 2026

The MGB is the best-selling British sports car of all time, affordable to buy, rewarding to drive, and supported by the deepest parts network of any classic import. Knowing which years to avoid saves you from an expensive restoration before you ever turn a wheel.

This guide covers

✓ 12-point inspection checklist

✓ Common issues & what to avoid

✓ In-person inspection guide

✓ Market pricing by year & condition

✓ 5 FAQs answered

✓ History & fun facts

Read the Full MGB Buyer's Guide

MG MGB Market Overview

Based on 49 MG MGB listings currently on ClassicCarsArena.com

Listed Now

$13,192

Avg. Asking Price

1956–1980

Year Range

Price Position on Our Site - Below Average

This car: $5,995

Low: $3,500 High: $29,995

Transmission Distribution

Manual 61% ◄

Condition Distribution

Excellent 24%

Good 14%

Fair 6%

Poor 4%

Data from ClassicCarsArena.com listings Browse all 49 listings →

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Classic MG MGB Buyer's Guide (1962–1980)

I came to the MGB through the back door, as a Datsun person who kept borrowing a friend's roadster for weekend runs up the coast. What struck me wasn't the horsepower (there isn't much) but the engineering integrity: a proper monocoque structure, all-synchromesh gearbox, independent front suspension, and a remarkably well-sorted chassis for a car designed in 1960. More than half a million MGBs were sold over eighteen years, which means parts availability is exceptional and the community is enormous. It also means the market is flooded with cars that have been poorly maintained, badly restored, or modified in ways that hurt both performance and value. Buying right requires knowing exactly what to look for.

What to Check Before Buying

✓

Sill structural test , Press firmly along both sills, any flex or softness indicates structural corrosion

✓

Floor pan inspection , Check from underneath; assess front corners at bulkhead and rear footwells

✓

Inner wing rust , Feel above front suspension turrets inside wheel arch for softness or holes

✓

Engine cold start , Should idle within 30 seconds; watch for blue smoke at startup (valve guides)

✓

Overdrive function , Test engagement at highway speed if fitted, should engage smoothly with rpm drop

✓

Wiring inspection , Check under dashboard for improvised repairs or non-standard wiring

✓

Boot (trunk) floor , Lift spare tire and inspect floor and spare well for rust

✓

Gearbox shifting , All four gears should engage cleanly without crunch or hesitation

✓

Temperature gauge , Drive to full operating temp, should stabilize around 80–90°C and hold steady

✓

Chrome bumper originality , Verify bumpers, overriders, and trim are period-correct for the model year

✓

Battery box condition , Check battery box under rear seat for acid damage and corrosion

✓

Hood / top frame , Test convertible top operation; inspect bows for breaks and weatherstrip condition

Common Issues

Sill rust is the primary structural concern and the MGB's most common serious problem. Because the sill is load-bearing in a unibody car, a rusted sill means the entire body lacks rigidity, doors will sag, gaps will open, and the car is genuinely unsafe to drive hard. Floor pan rust at the front corners and rear footwells is nearly universal on cars that have seen wet-climate use and is manageable but requires honest assessment of extent. Inner wing rust above the front suspension turrets is a more serious structural issue that affects geometry and alignment. The B-Series engine has an inherent tendency to run warm, and overheating, usually from thermostat failure or a clogged radiator, causes head gasket failure over time. British Leyland electrical systems of this era used a single-wire earth return through the chassis, which corrodes progressively; poor earths cause all manner of intermittent faults. The original Lucas electrical components have a deserved reputation for unreliability that can be addressed with modern relays and improved earthing.

What to Look For

Press firmly along both sills, the structural backbone of a monocoque MGB. Any flex, softness, or hollow sound indicates internal corrosion requiring major structural repair. Inspect floor pans from underneath, checking particularly the front corners at the bulkhead and rear footwells. Push your hand into the front wheel arches above the suspension turrets and feel for softness, inner wing rust here affects suspension geometry and is expensive to correct properly. Check the battery box area (under the rear seat on roadsters) for acid damage and corrosion. On chrome-bumper cars, verify the overriders are original, replacements are available but correct originals add value. Test overdrive if fitted: should engage smoothly at highway speed with a noticeable drop in engine revs. Check the wiring under the dashboard for improvised repairs, a consistent harness is important for fire safety on British cars of this era. Inspect the convertible top frame on roadsters for broken bows and correct folding action.

Price Guide

Chrome-bumper MGB roadsters (1962–1974) in driver condition trade at $12,000–$18,000; restored show-quality examples reach $28,000–$42,000 for the best early cars. The price premium for pre-1965 three-bearing engine cars is significant among purists, add 20–30% for correct early cars. Rubber-bumper cars (1975–1980) trade at a consistent 20–30% discount: drivers at $7,000–$11,000, excellent condition at $16,000–$22,000. MGB GTs (coupes) sell for 15–25% less than equivalent roadsters in the same condition, the best value in the segment. Project cars, running but rough, are available in the $3,500–$7,000 range and represent good value given parts availability. Beware "restored" cars with high asking prices and no documentation; a professional respray on a rusty car is common in this market.

Did You Know?

The MGB was in continuous production for eighteen years, making it one of the longest production runs of any sports car in history up to that point. Over half of all MGBs built were exported to North America, which is why U.S.-spec parts are the most common and least expensive to source worldwide. The MGB GT coupe was styled with input from the great Italian design house Pininfarina. When production ended in 1980, workers at the Abingdon factory staged a sit-in protest, the closure of MG's historic home factory was considered a national automotive tragedy in Britain.