The 2025 ZR15.5L LT7 twin-turbocharged DOHC V8 engine starts with the same architecture as Z06’s LT6, the most powerful naturally aspirated production V8 engine ever. However, it adds twin turbochargers, a factory Corvette first.

Unique to the 5.5L LT7 twin-turbo V8:
• Head castings with unique ports and a larger combustion chamber
• Valve train timing and lift profile optimized for forced induction with higher exhaust temp enabling exhaust valves
• Completely new intake system tuned for twin turbochargers
• CNC machined combustion chamber, exhaust and intake ports specific to the LT7
• Dual, ported shroud, ball bearing, mono-scroll (76 mm) turbochargers integrated with the exhaust manifold to reduce the volume and distance from the exhaust valve to the turbine wheel for quick response with electronic wastegates
• Intelligent anti-lag engine calibration techniques specifically for ZR1 that adapt and react to driving style

The LT7 engine also builds upon this engine architecture with:
• Added block and head machining to support turbo cooling and oiling
• Counterweight changes to account for a unique piston, and unique connecting rod for the crank train
• A secondary port fuel injection system added to deliver the needed additional fuel to support the engine’s massive output

There are numerous changes to the Corvette ZR1’s eight-speed dual-clutch transmission, including:
• Inner and outer input shaft upgrades
• Increased gear capacity with strength increased via shot peening for all gears
• Final drive refinements
• Oil management to support increased vehicle longitudinal and lateral capability
• Increased control valves to accommodate the higher required clutch clamp load for LT7