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What is the horsepower rating for a 1991 5.7 liter engine in Z71 truck?

The horsepower rating for a 1991 5.7L engine in a Chevy Z71 truck (assuming it's a Chevrolet, as Z71 is a Chevy trim level) varied slightly depending on the exact configuration. However, it was generally around 230 horsepower. You might find some minor variations depending on the specific model and options. To be absolutely sure, you'd need to check the vehicle's original documentation or the specifications listed on a GM parts website using the VIN.