LS7 - A legend in its own time. The LS7 was the standard engine in the C6 Corvette Z06 and its 7.0L displacement (427 cubic inches) makes it the largest LS engine offered in a production car. Unlike LS1/LS6 engines, the LS7 uses a Siamese bore cylinder block design – required for its big, 4.125-inch bores. Competition proven heads and lightweight components, such as titanium rods and intake valves, make the LS7 a street-tuned racing engine, with 505 horsepower.