* Porsche makes a wide range of cars, from relatively slow entry-level models to extremely fast, track-focused supercars.
* Corvette also has a range, though generally focused on high-performance sports cars.
A top-of-the-line Porsche 911 Turbo S will almost certainly be faster than a base model Corvette. However, a top-of-the-line Corvette Z06 might outperform a lower-spec Porsche 911 Carrera.
To get a definitive answer, you need to specify the exact Corvette and Porsche models you're comparing.
