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1966 Shelby Cobra 427 S/C

1966 Shelby Cobra 427 S/C

1966 Shelby Cobra 427 S/C

Of all the Cobra variants the 427 Semi/Competition or S/C is the most desirable series. Built from Shelby’s competition production line, these were purposeful race-cars that were prepared at the last minute for the road.

The story of the Cobra begins as early as 1959 when Carol Shelby raced for Aston Martin, winning the 24 Hours of Le Mans. Along the way he probably took notice of a well performing AC Ace that would become a foundation for his next venture.

After quitting racing, he return to America to build his own sportscar, turning to Charles Hurlock of AC Cars to supply a chassis and body that was suitable for the new 260 cubic inch Ford V8. After considerable racing success, Ford provided the even larger 427 FE engine. By 1965, chief engineer Ken Miles wanted to fit thengine to win SCCA’s A Production Class and stay ahead of the Corvette Grand Sport.

The Ford 427 was actually a 425 cubic inch V8 developed for the 427 NASCAR regulations. These were strictly race engines with solid lifters and became know for their side oil passage that sent oil to crank first before the valvetrain. Somewhere around 400 bhp was realized.

See full 1966 Shelby Cobra 427 S/C Gallery

With assistance from Ford and AC Cars, the team at Shelby American modified the existing AC chassis design to accommodate the big block engine. The completed design was called the mark III chassis was manufactured with larger and wider spaced chassis rails. Shelby ordered 100 of these from AC Cars.

Due to the weight of the engine the brakes and suspension were also upgraded. The body was featured prominent wheel arches to fit wider magnesium wheels and tires. Competition features included an oil cooler, side exhausts, large fuel filler, 42-gallon fuel tank, front jacking points and a roll bar.

Naturally, the 427 Cobra was expected to compete at the top level of motorsport and abroad. Shelby went into immediate production, finishing just over 50 cars when bad news struck. The FIA visited and was unsatisfied with the minimum number of cars required to homologate the 427 in the World Sports Car Championship. Needing 100 cars or more, Shelby’s market to was immediately slashed, he cancelled his order with AC, but still had 53 big block Cobras nearly completed.

Naturally some of these cars were sold in primer to American teams and drivers but 34 chassis were still without a home. Shelby’s east coast representative, Charles Beidler, suggested they paint the remaining cars and offer them as the fastest street car in the world.

Not soon after Shelby started fitting the cars with production windscreens. Out of 53 Cobras, CSX3001 through CSX3053, three were sent to Ford, 19 were sold for competition and the rest were converted for road use.

On the road, the S/C was a radical machine. Sports Car Graphic magazine editor Jerry Titus reached 0-100 mph in 13.2 seconds. By comparison the nearest Aston Martin of the day was barely capable of less then twenty seconds.

Due to the very limited production, original S/Cs are a rare sight. Only Shelby’s personal Super Snake was faster, using twin turbochargers to offer 800 bhp.

1966 Shelby Cobra 427 S/C Gallery

See full 1966 Shelby Cobra 427 S/C Gallery

1966 Shelby Cobra 427 S/C Video

See full 1966 Shelby Cobra 427 S/C Gallery

Specs & Performance

type Series Production Car
built at California, USA
engineers Ken Miles
production 31
price $ $ 9,500
engine Ford 427 Side Oiler V8
position Front Longitudinal
aspiration Natural
block material Cast Iron
valvetrain OHV 2 Valves / Cyl
fuel feed Dual 4-Barrel Holley Carburetors
displacement 6964 cc / 425 in³
bore 107.4 mm / 4.23 in
stroke 96.0 mm / 3.78 in
compression 11.5:1
power 305.7 kw / 409.9 bhp @ 5600 rpm
specific output 58.86 bhp per litre
bhp/weight 396.04 bhp per tonne
torque 626.39 nm / 462.0 ft lbs @ 2800 rpm
body / frame Aluminum over Tubular Steek Frame
driven wheels Front Engine / RWD
wheel type Top-Loader
front tires 185×15 Goodyear Blue Dot
rear tires 195×15 Goodyear Blue Dot
front brakes Girling Discs
rear brakes Girling Discs
steering Rack & Pinion
f suspension Unequal Wishbones w/Coil Spring over Dampers
r suspension Unequal Wishbones w/Coil Spring over Dampers
curb weight 1035 kg / 2282 lbs
wheelbase 2286 mm / 90.0 in
front track 1397 mm / 55.0 in
rear track 1372 mm / 54.0 in
length 3962 mm / 156.0 in
width 1727 mm / 68.0 in
height 1245 mm / 49.0 in
transmission 4-Speed Top-Loader Manual
gear ratios 2.20:1, 1.66:1, 1.31:1, 1.00:1
final drive 3.54:1
top speed ~265.5 kph / 165.0 mph
0 – 60 mph ~4.5 seconds
0 – 100 mph ~10.3 seconds
0 – 1/4 mile ~12.4 seconds

Sales and Chassis

CSX3021-1965 Shelby 427 S/C Cobra. Finished in March 1965 in Hertz Gold. Offered by Dick Walters Ford for several years before being purchased by Mr. Turner who kept it until 2010 with less than 3,900 miles from new. Displayed at the SAAC-15 Meet in Dearborn, Michigan. Sold at Gooding & Co’s Scottsdale Auction for $935,000 USD with an estimate of $1,800,000 – $2,500,000 USD.

CSX3035-Offed at Dana Mecum’s 2009 Original Spring Classic Auction, No Sale @ $1,300,000 USD. Described as “nvoiced on December 2, 1965 and ordered through Carroll Shelby’s Hi-Performance Motors on May 9, 1966, Shelby Cobra CSX3034 was completed on June 6, 1966 and picked up at the factory by its first owner Dale Kelley. Built to S/C specifications and finished in White with a Black interior, Black side pipes and equipped with quick jacks, it was traded by Kelley in 1968 to Bill Watkins Ford of Scottsdale. The car was purchased by Michael L. Shoen, who later authored the master historical work The Cobra-Ferrari Wars.

Shoen added a Blue stripe to the car which nicely harmonized with its Black exhaust and chromed roll bar. It won a Phoenix concours event in 1969 and ran some autocrosses until 1970, when Schoen advertised it for sale with the following description:

“’66 427 Cobra S/C. Factory competition model set up for the street. White/blue stripe. Front/rear sway bars, rebuilt suspension, new Konis, big Halibrands, 42 gallon tank, three fuel pumps, competition brakes, roll bar, differential/engine/oil coolers, headers, transistorized. New transmission, balanced, blueprinted, side-oiling 427 dyno-built by Holman and Moody. $8000 cash or with spares, $9000.”

3034 was shipped by its fifth owner, Gary Yahnke, to Mike McCluskey for restoration in 1977, during which it was repainted Black. It then went through several hands, winning a first place trophy at the Northeast Fall Rally in 1979. It appeared at the 1992 Lime Rock Vintage Fall Festival still in Black with Black sidepipes, chrome roll bar and quick jacks. It was then purchased by its ninth owner in 2000, fitted with new leather seats, repainted in its present Guardsman Blue with White stripes, and shown at SAAC 27, where it won the People’s Choice award.”

CSX3045 – Sold with a competition exhaust, this car’s second owner, Doug Carsen, raced it in SCCA events. By 1979 it was painted Guardsman Blue paint and offered for sale with 10,400 miles. By the eighties it was put in the collection of John Mozart and underwent an impressive restoration. It was sold in this condition with a genuine 17,000 miles on the odometer by RM Auctions at their 2007 Arizona sale for $1,430,000 USD.

Auction Sales History

1966 Shelby Cobra 427 S/C

1967 Shelby 427 ‘Semi-Competition’ Cobra CSX3045 – sold for $2,117,500 One of 29 authentic Semi-Competition Cobras built. Genuine and documented, with exceptional history. Authentic and well-maintained restoration. Long-term ownership by renowned Cobra enthusiasts. Part of the John Mozart Collection from 1988 onward who commissioned a full restoration by Mike Giddings, of Robin Automotive in Northern California. Auction Source: 2015 Amelia Island by RM Sotheby’s