* Gear ratios: Slight variations in the automatic transmission's gear ratios existed between model years and even within the same year depending on options.
* Axle ratio: The rear axle ratio significantly impacts top speed. A numerically lower axle ratio (e.g., 2.56) allows for a higher top speed than a numerically higher ratio (e.g., 3.08).
* Tire size: Different tire sizes alter the effective gearing, influencing top speed.
* Vehicle condition: Factors such as engine tune, aerodynamic drag (even minor differences like damaged trim), and overall mechanical condition affect the car's ability to reach its maximum speed.
* Weight: Additional weight from passengers or cargo reduces top speed.
While a 1972 Chevrolet Caprice with that engine likely had a top speed in the range of 85-95 mph, it's crucial to understand that's just an *estimate*. Reaching these speeds would also be significantly impacted by the factors listed above. Factory specifications rarely quoted top speeds, and achieving a true top speed in a 50-year-old car is unlikely due to safety and mechanical considerations.
