New 2023 Corvette Z06 Naturally Aspirated Engine Explained

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The 2023 Corvette Z06 debuts an all-new 5.5L DOHC V-8 engine that marks a return to natural aspiration for the track-capable performance model.

Engine responsiveness and trackability, two characteristics of naturally aspirated motors, were the top priorities for providing an engaging driving experience for purists. As a result, it was determined that a clean sheet naturally aspirated powerplant was needed, with the goal of exceeding the power of any naturally aspirated production V8 engine ever made. A lightweight, flat-plane crank design enables the engine to rev to the high rpms needed to create significant power.

More than horsepower, the new LT6 is designed to complement all aspects of the Z06’s track-focused performance experience. From its 8,600-rpm redline and full racing-style dry-sump oiling system to meticulously tuned induction and exhaust systems, this engine exudes an entirely new and emotional character.

The key to the LT6’s performance capability is a lightweight, low-inertia rotating assembly rooted in an all-new flat-plane crankshaft that, along with a comparatively short stroke (the distance each piston/connecting rod assembly travels with each rotation of the crankshaft), allows the engine to rev to its maximum range.

A version of the LT6 has powered the C8.R race cars since 2019, and the rigors of endurance road racing helped engineers refine the engine’s performance and durability.

Additional highlights include:

All-new aluminum cylinder block casting with the Small Block engine family’s signature 4.4-inch bore spacing
All-new dual-overhead-camshaft cylinder head design with fully CNC-machined combustion chambers and intake ports, supporting a mechanical “finger follower” valvetrain
Dual-coil valve springs to support titanium intake and sodium filled exhaust valves
Forged aluminum pistons and forged titanium connecting rods for low mass and high strength
Distinctive Edge Red camshaft covers
All-new active split intake manifold with twin 87 mm throttle bodies
All-new six-stage dry-sump oiling system with individual crank bay scavenging
Four-into-two-into-one stainless steel exhaust headers
670 hp at 8,400 rpm
460 lb. ft. of torque @ 6300 rpm
The LT6 is hand assembled by master engine builders at the Performance Build Center within the Bowling Green Assembly Plant in Kentucky. Builders use precision tooling and hand fit pieces of the engine to meet Chevrolet’s exact specifications. Each engine features a plaque on the intake manifold with the signature of the technician who crafted it from start to finish.

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