Horse power and torque for Chevrolet 454 engine?

The horsepower and torque figures for a Chevrolet 454 engine vary considerably depending on the year of manufacture, specific model (e.g., Mark IV, Big Block), and the level of modifications. There's no single answer.

A stock, naturally aspirated 454 from different years might range from approximately 230-450 horsepower and 400-500 lb-ft of torque. However:

* Early 454s (1970s): These often produced lower horsepower due to emission regulations and lower compression ratios compared to later models.

* Later 454s (late 1970s - 1990s): These engines could see a boost in horsepower and torque, depending on the specific application (trucks, cars, etc.).

* Modified 454s: With modifications like performance camshafts, carburetion upgrades, headers, and other engine work, the horsepower and torque figures can be significantly increased, often exceeding 600 horsepower and 700 lb-ft of torque.

To get precise figures, you need to specify the exact year, model, and any modifications of the Chevrolet 454 engine in question. You can often find this information on the engine itself (casting numbers), vehicle documentation, or online resources dedicated to classic Chevrolet engines.