1966 Shelby Mustang GT350-R

Chassis number 6S254 was the second Mustang GT350R constructed on the 1966 Mustang platform. It has been transformed into the R-model configuration to include a competition-type top-loader four-speed manual gearbox and a roll cage, oil cooler, side exhaust and R-model front apron with oil cooler air intake.

Recently, the car has taken part in European racing events, including the 2000 Tour Auto and the Historic LeMans Classic.

The 345 cubic-inch engine has been tuned to produce 470 horsepower. There is a four-barrel carburetor, roller camshaft, and a 1.65-inch exhaust. Many updates have gone into making this car a noteworthy and viable contender on the racing circuit.

Thirty-seven promotional Mustang cars were taken off the assembly line and given high-performance 289 V8 engines. Two were used to pace the Indianapolis 500 and featured a four-speed gearbox and upgraded suspensions. This configuration would later be offered as the top-of-the-line Mustang. The Mustang was one of the most attractive vehicles on the road. With its performance upgrades, it moved closer into the realm of sports car, though it was often outpaced by other marques such as the Pontiac GTO and the Chevelle. Since the car was labeled as a sedan, it was not allowed to compete in SCCA racing. Rules stated that the car had to be sports car. To resolve this issue, Ford turned to Carroll Shelby to build a version of the Mustang that could comply with SCCA Regulations.

The first obstacles to tackle were to convert the car into a two-seater and improve its engine and suspension. A minimum of 100 cars had to be constructed to satisfy homologation requirements. The 100 car rule was proving a little difficult to satisfy, so the decision was made to create both a racing and a street version. A common suspension was used for both versions. The racing version was given a competition engine. Ken Miles worked on developing the vehicles suspension while Bob Bondurant worked on the vehicles handling. Peter Brock, of Shelby American, was given two fastback cars to develop an identity for the new car that would be identifiable to the public.

Since the 100 car rule had to be satisfied in a short amount of time, the project was put under significant pressure to be completed. The cars had to be completed by January of 1965 in order to compete that season. The cars were given 289 cubic-inch Ford V8 engines and matted to a four-speed Borg-Warner aluminum gearbox. The rear end's were 9-inches and had a 3.89 gear ratio. The Ford and Shelby duo had meet the homologation requirements and were given permission to race in SCCA competition for the 1965 season.

The second batch of racers had chassis numbers 209 through 213. The final four racers had chassis numbers 527 through 540. This totaled 34 and 26 are believed to have survived in modern times.

The 350 R produced between 325-360 horsepower with a single four-barrel Holley carburetor. Additional improvements to the engine included Aluminum hi-rise intake manifolds borrowed from the Cobra. The wheels were American Racing five-spoke magnesium measuring 15x7. Additional welding to the body increased the body's strength. The front and rear bumpers were removed and a fiberglass apron was added. A hood scoop was added to increase the engines breathing and cooling capacity. Some of the cars had Mustang bucket seats while others, mostly the earliest of cars, were given fiberglass racing seats.

There is sometimes confusion on how the vehicle got its name, the '350'. Shelby had asked Phil Remington what the distance was between the race shop and the production shop. Remington had replied, '350 feet'. The name of the car was given GT 350 and the racing versions had an 'R' attached to the end of its name. Other stories have the birth of the name coming from the engine output or the square root of the total floor area in both factories.

The first Ford Shelby Mustang GT 350 R was sent to the Green Valley Raceway in Texas for Ken Miles to compete in the B-Production race held on Valentines Day. In its inaugural debut, it crossed the finish line ahead of the competition. The car was later made into the Shelby team's test car and used by Jerry Titus to test components in racing conditions. In 1965, Titus won the B-Production Championship.

Some of the earliest privateers to order the GT 350 R were Scuderia Filipinetti, Bob Johnson, and Comstock racing. Mark Donohue drove chassis number 105 and had tremendous success with the vehicle. Many of the cars did rather well in each event that they were entered, often beating their rivals, the Chevrolet Corvette.

The last batch of five cars were hard to sell. The price tag of $5,995 was not cheap but it was a very fair price for such a potent racer. These cars were eventually sold to a group of Peru individuals who ran the cars in competition mostly against each other.

By Daniel Vaughan | Apr 2007

Sold for $170,500 at 2007 Vintage Motor Cars at Amelia Island.
This 1966 Shelby GT350 'R' Model Conversion was offered for sale at the 2007 RM Auctions held in Amelia Island, Florida where it was estimated to sell between $90,000 - $175,000. The car is powered by a 289 cubic-inch Hi-Po V8 engine by Cobra Automotive capable of producing 400 horsepower. There is a magnesium Borg-Warner T-10 four-speed manual gearbox and four-wheel heavy duty disc brakes.

This car was converted to the 'R' specification in 2004. The exterior was changed from Candy Apple Red to Sapphire Blue with white racing stripes. To prepare the vehicle for racing, the car was given 15x7 inch magnesium American racing wheels, lightweight Plexiglas side windows in aluminum frames with pull cords, full roll cage, fire suppression system, brake upgrades, fully adjustable suspension system, front bumper valence, fiberglass hood, riveted side window covers, racing front springs, carbon brake pads, rear located battery, heavy duty radiator, and more.

At auction, this Model R Conversion sold for $170,500.

By Daniel Vaughan | Apr 2007