The 2023 Corvette Z06 debuts tomorrow morning, and it’s expected to raise the bar for attainable American performance, just as the previous C7 Z06 did before it. Spy videos of the supercar circling the Nürburgring teased new levels of aerodynamics, new levels of corner entry and exit speeds, and a completely different exhaust note than what we’re used to from this side of the pond. That exhaust note comes from a DOHC, 5.5L V8 engine featuring a flat-plane crankshaft that spins up to 8,600 RPM. This engine is called the LT6, and it’s the most powerful naturally aspirated DOHC V8 production engi…