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First, this engine is the most powerful naturally aspirated, internal combustion engine (by a good margin) of any production Chevrolet small-block ever produced. Boasting a massive 670 horsepower, the LT6 trumps almost all its Corvette predecessors (save for the 2019 Corvette ZR1 engine, which boasted 755 horsepower, but needed a supercharger).
1963 5.4L 327CI Engine in open hood of C2 Corvette
The 327CI small-block V8 was available to consumers in several distinct configurations, all of which produced varying degrees of output. Available in both carbureted and fuel injected forms, the 327CI small-block proved capable of producing anywhere from 250-360 horsepower, depending upon one’s choice of engine code.