1973 MG B GT V8

reserve met
6 Bids 92 Following Highest bidder - Lemillsier
Ends 2:00 PM, 16 Dec 2025
Current Bid

£14,000

reserve met
Lemillsier

Paul's review

Paul Hegarty - Consignment Specialist Message Paul

“ A fabulous example with rebuilt Oselli engine and receipts for major body rebuild in 2021 . ”

Heritage certified and MG owner's club member seller.

Background

It wasn’t lost on Ken Costello, engineer and championship winning touring car ace, that the MGB GT’s engine bay was on the roomy side. Indeed it had been designed to accommodate a V4 engine of an in house design before the NMC cost reduction police got wind of the idea. Whilst at a friend’s workshop, Ken was drawn to a compact looking V8 engine sitting on the bench awaiting repair. Despite its generous 3.5L capacity Ken was impressed to find he could almost lift the alloy V8 singlehandedly. The engine turned out to be the now iconic, Buick derived Rover V8 unit which first came to prominence for its transformational effect on the Rover P5 of 1967.

With the burly V8 being essentially no heavier than the MGB’s standard B-series unit, Ken could immediately see its potential for the MGB GT. This would mean that, unlike the 3-litre MGC, the balance of the car wouldn’t be seriously compromised by the fitting of a decidedly more sports car appropriate motor. Costello was soon marketing his own V8 equipped version of the MG which was very well received. So much so that Charles Griffin, then Director of Engineering for British Leyland, wrote to Costello requesting a viewing and a drive of his muscular MG. He was obviously impressed as by August 1973 an official Abington produced MGB GT V8 hit the streets. Concurrently BL also cut off Costello’s engine supply but not before something in the region of 225 units were thought to, ultimately, have left his workshops. 

British Leyland had opted to use a mildly tuned version of the 3.5L V8 with a lower compression ratio and breathing through twin SU HIF6 carburettors. In this trim power was originally quoted at around 135bhp. The key metric, however, was the impressive 193 Ib-ft of torque at a sensible 2,900rpm. This transformed the car’s driving dynamics, especially compared to the somewhat asthmatic B-series powered cars. Contemporary road tests recorded a 127mph top speed and a 0-60mph time of 7.7 seconds. The standing quarter mile was achieved in less than 16 seconds. For the first time in the car’s history, the MGB GT could now compete on equal terms with contemporaries like the Porsche 911T and Datsun’s 240Z. Around the time of the launch, however, the repercussions of the OPEC oil embargo were starting to be widely felt. This helped to tarnish the appeal of big V8 engine cars despite the MGB GT V8 being virtually as fuel efficient as its lesser endowed sibling. The car ceased production in 1976. During this three year production window a total of just 1,839 chrome bumpered cars were produced and only 742 with the later, US-mandated rubber bumpers.

Key Facts

  • Long Term Ownership
  • Body Recently Restored
  • Stainless Steel Exhaust and Manifold
  • Original Interior
  • Overdrive
  • Uprated Fans
  • GD2D1-527G
  • 62639 miles
  • 3528cc
  • manual
  • Teal Blue
  • Autumn Leaf
  • Right-hand drive
  • Petrol
Vehicle location
THE MARKET HQ, United Kingdom

Background

It wasn’t lost on Ken Costello, engineer and championship winning touring car ace, that the MGB GT’s engine bay was on the roomy side. Indeed it had been designed to accommodate a V4 engine of an in house design before the NMC cost reduction police got wind of the idea. Whilst at a friend’s workshop, Ken was drawn to a compact looking V8 engine sitting on the bench awaiting repair. Despite its generous 3.5L capacity Ken was impressed to find he could almost lift the alloy V8 singlehandedly. The engine turned out to be the now iconic, Buick derived Rover V8 unit which first came to prominence for its transformational effect on the Rover P5 of 1967.

With the burly V8 being essentially no heavier than the MGB’s standard B-series unit, Ken could immediately see its potential for the MGB GT. This would mean that, unlike the 3-litre MGC, the balance of the car wouldn’t be seriously compromised by the fitting of a decidedly more sports car appropriate motor. Costello was soon marketing his own V8 equipped version of the MG which was very well received. So much so that Charles Griffin, then Director of Engineering for British Leyland, wrote to Costello requesting a viewing and a drive of his muscular MG. He was obviously impressed as by August 1973 an official Abington produced MGB GT V8 hit the streets. Concurrently BL also cut off Costello’s engine supply but not before something in the region of 225 units were thought to, ultimately, have left his workshops. 

British Leyland had opted to use a mildly tuned version of the 3.5L V8 with a lower compression ratio and breathing through twin SU HIF6 carburettors. In this trim power was originally quoted at around 135bhp. The key metric, however, was the impressive 193 Ib-ft of torque at a sensible 2,900rpm. This transformed the car’s driving dynamics, especially compared to the somewhat asthmatic B-series powered cars. Contemporary road tests recorded a 127mph top speed and a 0-60mph time of 7.7 seconds. The standing quarter mile was achieved in less than 16 seconds. For the first time in the car’s history, the MGB GT could now compete on equal terms with contemporaries like the Porsche 911T and Datsun’s 240Z. Around the time of the launch, however, the repercussions of the OPEC oil embargo were starting to be widely felt. This helped to tarnish the appeal of big V8 engine cars despite the MGB GT V8 being virtually as fuel efficient as its lesser endowed sibling. The car ceased production in 1976. During this three year production window a total of just 1,839 chrome bumpered cars were produced and only 742 with the later, US-mandated rubber bumpers.

Video

Overview

Thanks to the accompanying Heritage Certificate we know a good deal about the origins of this impressive MGB GT V8. The car’s chassis number suffix of 527 confirms it as the 526th iteration of this model to leave Abington. It was produced between the 8th and 13th August 1973. It was dispatched from Abingdon on the 15th August heading to dealers Henleys of Northampton. The car was factory finished in Teal Blue paintwork with a cloth trimmed interior in an Autumn Leaf hue. Factory options included Dunlop cast alloy wheels and Laycock overdrive.

Between August 1973 and March 1999, the V8 would be enjoyed by eight registered keepers. In 1999 the MG was acquired by current keeper, Kim. At that stage the BGT V8 arrived with Kim having previously enjoyed both a full Oselli engine rebuild (in 1986) and a full body restoration and respray (in 1989). Kim reports that a further body restoration and rebuild was undertaken in 2021 with accompanying receipts within the paperwork archive. Kim’s long ownership reflects the pleasure it has given, especially on numerous continental tours and road trips.

Exterior

This Teal Blue example of the esteemed V8 MGB GT presents very well indeed. That blue livery exhibits a fine and lustrous shine throughout, and the colour suits this handsome sports car very well. Indeed Pininfarina collaborated with MG on the design of the coupe and that peerless aesthetic pedigree is still doing the business over 50 years later. The paintwork appears thickly and smoothly applied and the underlying bodywork looks very much its equal. There are a couple of sub-standard areas, but they are small and quite hard to casually spot.

Respray aside, this V8’s faithful originality that stands out, too. The light lenses and cabin glass all appear to be in fine order. That originality extends to the charming, period appropriate, black vinyl Tudor Webasto sunroof complete with chromed aperture surround and hinged Perspex wind deflector. The shapely body exhibits the full compliment of four V8 badges together with wing mounted British Leyland badges.

The car sits on its original set of distinctive Dunlop light alloy wheels. These are 14-inch items which are composite wheels consisting of cast alloy centres, with chrome plated steel rims rivetted to them. The centres are adorned with 10 oblong cutouts which are edged with polished alloy. They appear to be in a good overall condition and set off the look of the MG perfectly. The wheels are fitted with a matching set of Roadstone tyres in a 185/70 configuration which appear to date from 2021.

Interior

Speaking of originality, the V8’s cabin is an absolute paradigm of it. The fabric upholstery is thought to be original, and its Autumn Leaf hue remains bright and clean with it exhibiting the signature needle cord finish. Seat sides and generous headrests are finished in a complementary coloured vinyl. The rear folding bench is identically upholstered but is very much of a token item and is best suited to additional luggage storage if and when needed.

The dashboard presents in the familiar crackle finished black paint. Within this, and directly ahead of the driver, is a moustache shaped vinyl dressed panel housing the white on black Smiths speedometer and tachometer. The original three spoke alloy fitted MG steering wheel is present and the deployment of the overdrive is courtesy of the column mounted stork just behind it. 

In the boot the Autumn hued, edge bound carpet mat matches the main cabin’s flooring. The underlying panel lifts to reveal a fifth Dunlop alloy wheel as a spare and the original jack and tools. The diminutive rear bench folds forward to further extend the boot space as required. The spare wheel aperture seems to be in a fine condition, too.

Mechanical

The 3.5L V8 as adopted by Rover really needs no introduction and, in this application, is particularly unstressed with its lower compression ratio. It’s all about the torque really, making the V8 a relaxed cruiser with more than sufficient urge to render it transformed over lesser engined MGB GTs. Power is fed to the rear wheels via a four speed, full synchromesh manual gearbox. A switch operated, Laycock overdrive is fitted for use with third and fourth gears. Brakes are discs up front and drums at the rear. As already mentioned this particular unit enjoyed an Oselli upgrade in 1986 and no known mechanical issues have been reported.

The under-bonnet presentation helps underscore the charming originality of this car. The twin SU carburettors are present and correct and the original, distinctive slimline air intake system remains unmolested. The expected data plates are also present. The condition under here is good indeed and an uprated cooling fan set up is also noted. The underside of the car looks very well undersealed and finished. A stainless steel exhaust system is noted, and this is reported to include a stainless steel manifold also.

History

The paperwork archive features the current V5 is present in Kim’s name. This classifies the car as a Historic Vehicle, and it is hence MoT and VED exempt in the UK. The car was last MoT’d in 2009. An informative Heritage Certificate is also on hand detailing the car’s factory record.

Other paperwork includes reams of invoices from all periods of the car’s history. There is also an original V8 owner’s manual and an MG Owners Club valuation certificate from 2022. There are also numerous photographs included which document the restoration work from both the 1980’s and from 2021.

Summary

The MGB GT was a handsome and modern car complete with a monocoque construction and even engineered in crumple zones, when it was launched in 1965. What it wasn’t, however, was a particularly inspiring drive mostly due to the less than thrilling 1.8-litre B-series engine and its modest 95 bhp. The V8 iteration of 1973, however, did what the 3-litre MGC failed to do – give the car impressive urge whilst still retaining its light weight and resulting poise. This, combined with a very un-MG-like production run of just a couple of thousand, makes this the undisputed king of the MGB GTs.

We are happy to offer this car for auction with an estimate in the range of £15,000 - £18,000.

This example is a charmer. Its bright blue colourway and faithful originality really help endear it to those in the know. It has clearly benefitted from plenty of restorative attention but not at the cost of desirable originality. An earlier Oselli engine upgrade is sure to please the purists, too. No surprise, perhaps, that this example is offered from a 25-year period of enthusiast ownership. The lucky new owner should be able to enjoy an increasingly rare and sought after British V8 sports car without having to address any pressing issues. Surely an ownership prospect too enticing to miss?

Viewing is strongly encouraged, and this lot is located at THE MARKET, HQ. Viewings are STRICTLY BY APPOINTMENT and we are open weekdays between 10am - 12pm or 2pm - 4pm. To make a booking, please use the ‘Enquire About This Vehicle’ button on the listing. Feel free to ask any questions, or try our ‘Frequently Asked Questions’.

About this auction

Estimated value

£15,000 - £18,000

Seller

Private: OXO
Buyer's Premium
7% of the winning bid (minimum £700), plus 20% VAT on the Premium only.


Viewings Welcome

Viewing is strongly encouraged, and is strictly by appointment. To book one in the diary, please get in contact.

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