Story
1966 Shelby Cobra
The 1966 Cobra was the coil-spring Mark III roadster: a wider, stronger development of the AC and Shelby platform built around Ford FE big-block power. The familiar name was 427 Cobra, but surviving records show both 427 and 428 engines. Street, Competition, and S/C cars share a family while differing materially in engine tune, cooling, fuel system, body openings, exhaust, brakes, suspension preparation, and cockpit equipment.
One Cobra family, two street engines
Early street examples are documented with Ford's 427 side-oiler or medium-riser V8. A reviewed CSX3165 record lists a single Holley four-barrel and 425 bhp, while another late chassis was delivered with optional dual-carburetor induction. During the program Shelby substituted the less expensive 428 Police Interceptor for many street cars while retaining the 427 Cobra name. CSX3284 and CSX3293 are documented 428 examples; a later 427 installation does not rewrite how a car was delivered.
The regular drivetrain was a Ford Toploader four-speed. Exact engine casting and assembly identity, carburetion, gearbox case, shifter, differential ratio, and component dates require the Registry record, invoices, restoration file, and inspection of the individual chassis.
The coil-spring chassis
The Mark III retained a 90-inch wheelbase but used a wider four-inch-tube frame, independent wishbone suspension with coil springs and tubular dampers, rack-and-pinion steering, an independent rear drive unit, and Girling discs at all four wheels. Street and competition records document different brake, spring, damper, cooling, tank, exhaust, wheel, and body details; they cannot be mixed into a single universal hardware list.
Street, Competition, and S/C
A regular street car can have under-car exhaust, a plain hood, road-car bumpers, weather equipment, and a stock dashboard. Full Competition cars were race builds. The 29 documented S/C conversions retained much of the competition appearance and equipment, including hood scoop, oil cooler opening, side exhaust, roll bar, large fuel tank, external filler, and other specialized hardware. Those visible pieces are not proof that another car was born as a Competition or S/C Cobra.
Orders, colors, and model-year boundaries
Reviewed chassis records document red or Rangoon Red over black, green over black, Ivy Green on an S/C conversion, black Connolly leather, Smiths instruments, a Lucas ammeter, Halibrand wheels, soft tops, side curtains, wind wings, and optional dual-carburetor induction. They are useful exact-car examples, not a complete 1966 palette or option chart.
AC billing, ocean shipment, Shelby completion, invoicing, retail sale, title year, and later restoration can fall in different years. CSX3216 is cataloged as a 1966 Cobra but titled 1967; CSX3102 was billed in 1965 and has Shelby-supplied replacement bodywork; CSX3293 was delivered with a 428 and later received a 427. The CSX record and documentary chronology control, not one date or component in isolation.
Production and identity
Reviewed sources report 348 coil-spring 427/428 Cobras across 1965-1967 and 260 street roadsters, plus 23 full Competition cars and 29 S/C conversions under one commonly cited accounting. Other collection summaries use different early Competition and S/C counts, so none is presented as an audited 1966-only total.
Authenticating a Cobra starts with its CSX3000-series identity and current Registry history. Shelby and AC paperwork, chassis construction, aluminum body and panel stamps, delivered 427 or 428 configuration, Toploader, rear drive, suspension, brakes, colors, trim, ownership, repairs, and restoration records must agree. Replicas, continuation cars, re-creations, Superformance cars, modern drivetrains, side pipes, hood scoops, roll bars, stripes, and badges cannot establish an original 1966 Shelby Cobra.
Market context
The market records below span street 427, street 428, S/C, survivor, restored, modified, and condition-guide observations. Every amount belongs to one chassis or a clearly labeled guide configuration. Registry standing, body and drivetrain originality, completion history, competition provenance, restoration quality, and later modifications can move value dramatically; these records are context, not an appraisal.