How to Determine the Authenticity of a 1966 GTO

For car collectors and enthusiasts, owning a genuine 1966 GTO is a dream come true. However, with the prevalence of replicas and modified vehicles, verifying the authenticity of a potential purchase is paramount.

Decoding the Vehicle Identification Number (VIN)

The VIN is the cornerstone of GTO authentication. Located on the driver’s side door jamb, it provides a wealth of information.

First character: Should be “2” for Pontiac.
Second character: “4” indicates a GTO model.
Third character: “2” or “3” for a hardtop or convertible, respectively.
Fourth character: Indicates the engine size: “S” for 389ci, “T” for 400ci, or “U” for 428ci.
Fifth character: “0” or “1” for a 2-speed or 3-speed automatic transmission.
Sixth character: “N” or “P” for 1966 model year.
Seventh character: Consecutive production number.

Inspecting the Exterior

Authentic GTOs exhibit distinct exterior features:

Hood scoop: Should be functional and aligned with the carburetor.
Front grille: Features the “GTO” emblem and “Pontiac” script.
Rear quarter panels: Should have “GTO” and “6.5-liter” (389ci) badges.
Rear spoiler: Made of fiberglass and painted body color.
Tri-Power air cleaner: On models with dual-quad carburetors.

Examining the Engine

The engine is the heart of a GTO:

Engine code: Should match the fourth character of the VIN.
Intake manifold: Has a unique “6.5-liter” (389ci) casting.
Exhaust manifolds: Should have a “Pontiac GTO” stamp.
Valve covers: Painted red and adorned with the “GTO” emblem.

Other Considerations

Documentation: Original paperwork, such as the build sheet and title, can provide valuable evidence.
Provenance: Tracing the car’s ownership history can help verify its authenticity.
Expert opinion: Consulting with a reputable Pontiac historian or GTO specialist can provide valuable insights.

Conclusion

By carefully scrutinizing the VIN, inspecting the exterior, examining the engine, and considering other relevant factors, you can determine the authenticity of a 1966 GTO. This comprehensive guide empowers enthusiasts and collectors to make informed decisions when acquiring these iconic muscle cars.

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