The LT4 is a gasoline internal combustion engine produced by General Motors for use in ultra-high-performance vehicles. Part of GM’s 5th-generation Small Block engine family, the engine displaces 6.2 liters, has eight cylinders in a “V” layout, and features a purpose-built supercharger.
The engine originally debuted in the Corvette C7 Z06 before going on to power the third-generation, 2016-2019 Cadillac CTS-V as well as the sixth-gen Camaro ZL1, followed by the Cadillac CT5-V Blackwing and Cadillac Escalade-V.
Displacement: | 6.2L / 376 cu. in. |
Aspiration: | Forced Induction (Supercharger) |
Vehicles: | Cadillac CTS-V, Chevrolet C7 Corvette Z06, Camaro ZL1, Cadillac CT5-V Blackwing, Cadillac Escalade-V |
Introduced: | 2014 model year |
Discontinued: | - |
Predecessor: | LS9 / Gen 4 Small Block |
Successor: | - |
Assembly: | Tonawanda, New York (Z06, CTS-V, ZL1); Performance Build Center, Bowling Green Kentucky (CT5-V Blackwing) |
Overview
The LT4 is the most powerful production engine ever offered in a General Motors vehicle. The LT4 engine builds on the design strengths of the previous LS9 supercharged engine used in the sixth-generation Corvette ZR1 and leverages the technologies introduced on the seventh-generation Corvette Stingray, including direct injection, cylinder deactivation and continuously variable valve timing, to take Corvette performance to an all-new plateau.
The LT4 is based on the same Gen 5 small block foundation as the 6.2L LT1 naturally-aspirated engine, incorporating several unique features designed to support its higher output and the greater cylinder pressures created by forced induction.
Engine highlights include:
- Next generation Eaton supercharger
- Dual-brick air-to-liquid intercooler
- Rotocast A356T6 aluminum cylinder heads that are stronger and handle heat better than conventional aluminum heads
- Lightweight titanium intake valves
- Forged powder metal steel connecting rods which are highly machined to an optimized geometry for increased strength while eliminating unnecessary reciprocating mass
- Forged aluminum pistons with unique, stronger structure to ensure strength under high cylinder pressures
- Stainless steel exhaust manifolds for structure at higher temperatures
- Aluminum balancer for reduced mass
- Standard dry-sump oiling system with a dual-pressure-control oil pump
- Dual-pressure-control and variable-displacement vane pump with increased flow capacity
- Dual-equal cam phasing
- PCV integrated rocker covers
- Direct Injection, which allows for a relatively high 10.0:1 compression ratio
- A high compression for a forced-induction engine, which enhances the LT4’s performance and efficiency
- High-pressure fuel pump
- Active fuel management/Cylinder deactivation
Specifications
Displacement: | 6162cc (376 ci) |
Engine Orientation: | Longitudinal |
Compression ratio: | 10.0:1 |
Valve configuration: | Overhead valves |
Valves per cylinder: | 2 |
Assembly sites | |
For CTS-V, Camaro ZL1 | Tonawanda, New York |
For Corvette Z06: | Bowling Green, Kentucky |
Valve lifters: | Hydraulic roller |
Firing order: | 1 – 8 – 7 – 2 – 6 – 5 – 4 – 3 |
Bore x stroke: | 103.25 x 92mm |
Fuel system: | DI |
Fuel Type: | Premium required |
Maximum Engine Speed: | 6600 RPM |
Drive Belt Rib Count: | 8 |
Materials | |
Block: | Cast aluminum |
Cylinder head: | Cast aluminum |
Intake manifold: | Cast Aluminum Supercharger |
Exhaust manifold: | Cast Stainless (Corvette) or Fabricated Stainless (CTS-V) |
Main bearing caps: | Cast Nodular |
Crankshaft: | Forged steel |
Camshaft: | Billet Steel |
Connecting rods: | Forged Powder Metal |
Emissions Controls | |
Catalytic converter | |
Three-way catalyst | |
Positive crankcase ventilation | |
Additional Features | |
1.74 L/rev Supercharger | |
Integrated dual coolant-to-air-intercoolers | |
Active Fuel Management | |
Variable Valve Timing (VVT) | |
Electronic throttle control | |
Extended life coolant | |
Extended life spark plugs | |
Oil Life Monitor System | |
Dexos 5W30 | |
Dual-pressure control and variable displacement oil pump | |
Dry sump (Corvette only) | |
58x crank timing |
Vehicle Applications
Year | Make | Model | Transmission (RPO) | Power (hp / kW @ RPM) | Torque (lb-ft / Nm @ RPM) | |
---|---|---|---|---|---|---|
2015 – 2019 | Chevrolet | C7 Corvette Z06 | GM 8-Speed HydraMatic Auto 8L90 (M5U) | 650 / 485 @ 6400 | 650 / 881 @ 3600 | |
2015 – 2019 | Chevrolet | C7 Corvette Z06 | Tremec 7-Speed Manual TR6070 (MEK) | 650 / 485 @ 6400 | 650 / 881 @ 3600 | |
2016 – 2019 | Cadillac | CTS-V Sedan | GM 8-Speed HydraMatic Auto 8L90 (M5U) | 640 / 477 @ 6400 | 630 / 855 @ 3600 | |
2017 – present | Chevrolet | Camaro ZL1 | GM 10-Speed HydraMatic Auto 10L90 (MGL) | 650 / 485 @ 6400 | 650 / 881 @ 3600 | |
2017 – present | Chevrolet | Camaro ZL1 | Tremec 6-Speed Manual TR6060 (MJK) | 650 / 485 @ 6400 | 650 / 881 @ 3600 | |
2022 – present | Cadillac | CT5-V Blackwing | GM 10-Speed HydraMatic Auto | 668 / 498 @ 6500 | 659 / 893 @ 3600 | |
2022 – present | Cadillac | CT5-V Blackwing | Tremec 6-speed Manual | 668 / 498 @ 6500 | 659 / 893 @ 3600 | |
2023 – present | Cadillac | Escalade-V | GM 10-Speed HydraMatic Auto 10L90 | 682 / 509 @ 6000 | 653 / 885 @ 4400 |
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