* LT1: This was a 5.7-liter (350 cubic inch) small-block V8 engine producing 300 horsepower and 340 lb-ft of torque. It was the standard engine for the year.
* ZR-1: This was a 5.7-liter (350 cubic inch) small-block V8 engine with a quad-cam design and a Roots-type supercharger. It produced 375 horsepower and 370 lb-ft of torque, making it the top-of-the-line engine option for the year.
It's important to note that these are the standard engine options, and some Corvettes may have been modified with different engines. To determine the exact engine in a specific 1991 Corvette, you would need to consult the vehicle's identification number (VIN).
