General Motors unveiled the new 2023 Corvette Z06 in October of 2021, ushering in the next level of performance for the eighth-generation C8 Corvette lineup. The main party piece in the 2023 Corvette Z06 is the new naturally aspirated 5.5L V8 LT6 gasoline engine, however, some customers complain that their LT6 makes a loud ticking noise. Now, GM is issuing a fix for this issue.
According to General Motors, the issue can manifest as a ticking, tapping, or snapping noise from the engine on some units of the 2023 Corvette Z06. It’s unknown at this time how many units may be affected.
GM notes that the LT6 incorporates a mechanical valvetrain design and does not use traditional hydraulic lifters. As such, some mechanical ticking noise from the valvetrain is normal. However, the noise could become excessive and not periodic, which may be the result of misaligned camshaft caps.
The ticking noise may be heard when the engine is idling, and could become more noticeable with the rear engine hatch open and the vehicle in Tour mode. In addition, the noise may become more audible as the engine warms up to its normal operating temperature. A GM technician will use a PicoScope to verify the noise concern, both before and after the realignment procedure is performed.
For reference, the 2023 Corvette Z06’s naturally aspirated 5.5L V8 LT6 is rated at a maximum of 670 horsepower and 460 pound-feet of torque, with redline set at 8,600 rpm. Standout features include dual overhead cams and a flat-plane crankshaft, with an all-aluminum block, forged aluminum pistons, forged titanium connecting rods, an active split intake manifold, twin 87 mm throttle bodies, and a racing-inspired dry-sump oiling system.
Under the body panels, the 2023 Corvette Z06 rides on the GM Y2 platform, with production taking place exclusively at the GM Bowling Green plant.