Carroll Shelby's big-block Mustang — the 428 Cobra Jet–era GT500 of the late 1960s.
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Introduced in 1967, the Shelby GT500 replaced the small-block GT350 as Shelby's headline Mustang and used the 428 Police Interceptor V8, with the 428 Cobra Jet introduced from April 1968. Bodywork comprised a fastback or convertible (from 1968) with Shelby-specific fibreglass nose, hood and tail panels. The 1968 'KR' (King of the Road) carried the Cobra Jet engine.
Production was roughly 2,048 cars in 1967 and approximately 4,451 in 1968 across all GT500 derivatives, including GT500 KR variants.
Definitive late-1960s Shelby Mustang — Cobra Jet engine, fastback styling and Carroll Shelby provenance.
| Variant | Years | Production | Notes |
|---|---|---|---|
| GT500 (1967) | 1967 | 2,048 | 428 Police Interceptor V8; fastback only. |
| GT500 (1968) | 1968 | — | 428 PI or 428 Cobra Jet; fastback and convertible. |
| GT500 KR (1968) | 1968 | — | King of the Road; 428 Cobra Jet; ~1,571 units. |
Start with identity, paperwork and originality. For the Ford Mustang Shelby GT500 (1967–1968), the strongest cars have continuous ownership history, matching numbers where applicable, original books and tools, factory build documentation and evidence of work by manufacturer-approved specialists. Marti Report, original drivetrain, KR Cobra Jet provenance and quality-restoration documentation.
428 Police Interceptor and Cobra Jet engines are well-supported; documented numbers-matching specification is critical. A proper pre-purchase inspection includes cold-start behaviour, ECU diagnostics and fault-code history (where applicable), leak-down or compression testing, underbody photography, suspension and chassis inspection, brake condition and a long enough road test to expose heat-related faults. Deferred maintenance on a car of this class is almost always more expensive than buying a better-sorted example.
Use a paint-depth gauge, lift access and a specialist familiar with the model's factory panel gaps and finish standards. Collector value is dramatically affected by structural repairs, refinished panels, poor paintwork and missing factory trim or option content. Documented cosmetic refresh is acceptable; concealed accident or fire damage must be priced severely.
Documented Marti Report cars, original drivetrain, KR provenance and matching factory paint codes drive value. Specification, colour, options and limited-build variants move values significantly. Buy the best-documented example in the most desirable specification you can justify, rather than a tired example of a rarer derivative that will need years of corrective work.
Regional ranges authored independently — each reflects its local market, not an FX conversion
Budget annually even if the car is used sparingly. Fluids age, tyres and date-coded rubber components must be replaced regardless of mileage, and stored cars need exercise. A documented maintenance rhythm protects both reliability and resale value.
Strong US specialist network covers the model; UK and EU support is concentrated in classic American specialists. Before purchase, confirm parts availability for model-specific bodywork, electronics, gearbox and engine components. A discounted car waiting on unobtainable parts or a factory service slot is rarely a saving in collector ownership.
Each region quoted in its local currency — independent market readings, not FX conversions
Mature US collector market with strong KR demand. Documented cars hold value; clone and tribute cars trade well below.
| Date | Auction | Car | Mileage | Result |
|---|---|---|---|---|
| 2025-01-12 | Mecum Kissimmee | 1968 GT500 KR Convertible | 45,000 mi | $418,000 Sold |
Mature US muscle market; KR and documented cars are blue-chip, broader market is stable.
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