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What is the normal running temperature for a 454 big block Chevy?

The normal operating temperature for a 454 big-block Chevy, or any engine for that matter, isn't a single number. It depends on factors like the engine's condition, the ambient temperature, and the coolant used. However, a generally accepted range is 180-220°F (82-104°C).

Ideally, you want to aim for the lower end of that range (around 180-195°F) for optimal efficiency and engine longevity. Running consistently above 220°F indicates a problem that needs attention. Consult your vehicle's owner's manual for the manufacturer's specific recommendations.