* L48: A 5.7L (350 cubic inch) small-block V8, the most common engine. It produced around 185 hp.
* L82: A higher-performance version of the 5.7L (350 cubic inch) small-block V8, producing around 210 hp. This was the "performance" option for the year.
There wasn't a big-block option available in the 1977 Corvette.