Market Finds: This MG Heading To Auction Is Far More Special Than It Looks

This MG Heading To Auction Is Far More Special Than It Looks

By Andrew Golseth
April 14, 2016

Photography courtesy of RM Sotheby’s

The MGB and MGC series are some of the most common classic sports cars. You don’t even have to be into cars and you’ll likely know what an MG is, and probably that it’s British. It’s hard to dislike their simple, near timeless design—hell, even my mother, who’s no petrolhead, lovingly owned two of them in the 1980s.

With classic sportscar proportions, lightweight construction, and a capable chassis, it’s easy to see why they were, and still are, so popular amongst enthusiasts. In a sense, they’re the Volkswagen Beetle of the sports car realm: cheap, easy to work on, and they made a ton of them—more than a half million, in fact.

If you’re an MG fanatic, you’ll likely recognize the very special black and gold specimen photographed here. But if you’re like me, at first glance you probably think this is some do-it-yourselfer’s garage built one-off racecar, but you’d be wrong. Turns out, this is one of six GTS Sebring models by The British Motor Corporation (BMC) Competition Department…well, sort of.

In 1966, the BMC race house in Abingdon began a new program in hopes to boost sales for the not-yet-released MGC. Starting off with six MGB/MGC hybrid chassis, the development team began by constructing just two prototypes. Knowing its tuned straight six engines weren’t mighty enough to outrun the competition, the team took a different approach for speed: by shedding as much weight as possible.

While the chassis remained steel, the doors, roof skin, bonnet, boot lid, and blister arched fenders and quarters were crafted from aluminum. The headlamps received plastic aero-covers, widened spoke wheels wrapped in sticky tread were tucked snuggly under the widened panels, and the unnecessary bumpers were removed—we love bumper-less classics.

The two “GTS” prototypes went on to race in the Targa Florio, Marathon de la Route at Nürburgring, and Sebring before the program was cancelled in 1970—but whatever happened to the remaining four BMC chassis? Remember, only two of the six hybrid chassis were completed by BMC. Well, this 1969 MG MGC GTS Sebring is one of those remaining four cars.

Upon dissolution of the BMC “GTS” competition program, Austin-Healey specialist John Chatham was offered the unfinished surplus, which he thankfully purchased. John completed chassis MGC 500757 for competition using the latest goodies in the BMC parts bin—making this car an even better performer than the two BMC GTS racers. Stronger magnesium Minilite rollers were selected over the standard brittle wire wheels—but the originals are included in the sale. What makes this already very special MG even more unique is what lies under the alloy bonnet.

During the BMC GTS racing program, straight six aluminum block powertrains were tested but never installed in either of the two racing prototypes—this Sebring is believed to have the only remaining aluminum block left in existence. With triple Webers feeding the established 220 horsepower on tap, this bespoke “super lightweight” GTS Sebring weighs just ~900 kilos (less than one ton)!

John Chatham extensively raced this custom super-MG at Silverstone, Castle Combe, and more, until selling the car to its current owner in 2004. The car has since been restored and is now ready for another half century of competition.

It’s odd to see such a common-looking car in such an elevated light, but if superhero movies have taught me anything, it’s that exceptional things are often hiding in plain sight.

– One of six genuine GTS Sebring chassis
– Driven by racing legend John Chatham

Est. 220 hp, 2,912 cc OHV inline six-cylinder engine with triple Weber carburetors, four-speed manual transmission with overdrive, independent front suspension, live rear axle with semi-elliptical leaf springs, and four-wheel hydraulic disc brakes. Wheelbase: 2,311 mm.

Vehicle information
Chassis no.:  MGC 500757
Engine no.: AXSP JC 101
Body no.: GCD1 03307

– Complete with FIA paperwork
Auction house: RM Sotheby’s
Estimate: TBD
Price realized: Auction on May 14


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Patrick Frawley
Patrick Frawley
7 years ago

It’s the British parallel to the Porsche 914-6 GT. Which is a very good thing.

7 years ago

Always loved the MGB. Must have one.
Did GS just say something positive?

7 years ago

I am a pretty avid MG man. This is one of my top favorites. Great to see some MG love.

Clayton Merchant
Clayton Merchant
7 years ago

Great to see MG get some respect on this site, it is well deserved.

The Sebring MGC was a pretty special car indeed, however,only 2 were ever raced, one finishing first in class and 10th overall at the Sebring 12 hours of 1968.

They returned in ’69 and were entered in class 11 at Sebring against such cars as Ferrari 312P’s, Porsche 908/2’s and Alfa T33’s and finished a very respectable 5th & 6th in the class. This would also be the last race ever entered by the MG “works” racing department.

Ironically British Leyland wouldn’t even take them home to England after the race, offering them both for sale locally for $4500 each including a bunch of factory spare racing parts.

The first car was equipped with a 2 liter 4 banger making about 150HP which was a “B” motor, the others were equipped with the 3 Liter 6 cylinder that would become the motor that differentiated the B and the C.

As stated, there were aluminum blocks and heads created for the Sebring prototypes, but only one car ever raced with the aluminum block with disappointing results and they were dispensed with, all stock being sold to John Chatham, but the aluminum heads proved more successful.

This is a great car with some great history behind it, whoever buys it will be pleased.

Guitar Slinger
Guitar Slinger
7 years ago

OK … so the obvious question on the header here is ;

Just how ‘ special ‘ does a special car have to look in order for it to qualify as ‘ special ‘ ?

Because just one look at the lead photo told me right off the bat this is one pretty damn special MGB GT !

Guitar Slinger
Guitar Slinger
7 years ago
Reply to  Guitar Slinger

FYI ; nothing about this cars appearance suggests it being a ‘ Tuner ‘ garage special . Everything once again at first glance says … this was either a factory job … or one serious race shop back in the day’s one off because it is all about the go .. the only ‘ show ‘ being the high level and quality of the craftsmanship .