What is the horsepower and torque ratings for a 1975 454 truck engine?

There's no single answer to the horsepower and torque ratings for a 1975 454 truck engine. The 454 cubic inch (7.4L) engine was offered in several variations in 1975, each with different horsepower and torque outputs. These variations depended on the specific truck model, the intended application (light duty vs. heavy duty), and the carburetor and other components used.

To find the exact horsepower and torque for a specific 1975 truck with a 454, you'd need to:

* Find the engine's RPO code (Regular Production Option code): This code is usually found on a sticker or plate somewhere in the engine compartment, or on the vehicle's original documentation. The RPO code will identify the specific engine configuration.

* Consult a 1975 Chevrolet truck brochure or parts catalog: These documents will list the horsepower and torque ratings for each engine RPO code offered that year.

* Use an online database: Some websites specialize in GM vehicle specifications and may allow you to search based on the year, model, and RPO code (if you can find it).

Without the specific RPO code, providing accurate horsepower and torque figures is impossible. Expect the horsepower to range from roughly 240 to 270 hp, and torque to be in the 360-400 lb-ft range, but these are broad estimates and can vary significantly.