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
Sixteen fuel injectors
Dual turbos put out 20 PSI of boost
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 engines massive output
To support the dramatic increase in power from the LT7 engine, engineers made numerous changes to the Corvette ZR1s 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
