The Chevrolet LT4 is a 6,162 cc, V8 gasoline engine produced between 2015 and 2023. It features overhead valve (OHV) architecture with two valves per cylinder, direct fuel injection (DI), and a supercharger. In standard configuration, it delivers 640 hp (477 kW) and 630 lb-ft (854 Nm) of torque, providing high-output performance ideal for high-performance sports cars and muscle cars.
Fitted to models such as the Chevrolet Corvette Z06, Chevrolet Camaro ZL1, and Cadillac CTS-V, the LT4 was engineered for maximum power and track capability. Emissions compliance was achieved through a close-coupled catalytic converter, electric supercharger bypass valve, and closed-loop fuel control, allowing the engine to meet EPA Tier 3 Bin 30 and Euro 6d standards across its production run.
One documented concern is supercharger bypass valve actuator failure observed in 2016–2017 production units, highlighted in General Motors Service Information Bulletin 17124. The issue arises from electrical connector degradation due to prolonged heat exposure, leading to erratic supercharger operation and reduced boost. GM issued a revised actuator with improved sealing and thermal protection in 2018 to resolve the condition.
Chevrolet
Production years 2015–2017 meet EPA Tier 3 Bin 50 and Euro 6c standards; 2018–2023 models comply with EPA Tier 3 Bin 30 and Euro 6d (EU Commission Regulation 2018/858).
The Chevrolet LT4 is a 6,162 cc V8 gasoline engine engineered for high-performance applications (2015–2023). It combines supercharged power with direct fuel injection to deliver extreme top-end output and track-ready reliability. Designed to meet EPA Tier 3 Bin 30 and Euro 6d standards, it balances performance with stringent emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 6,162 cc | |
| Fuel type | Gasoline | |
| Configuration | V8, OHV, 16-valve | |
| Aspiration | Supercharged | |
| Bore × stroke | 103.25 mm × 92.0 mm | |
| Power output | 477 kW (640 PS) @ 6,400 rpm | |
| Torque | 854 Nm @ 3,600 rpm | |
| Fuel system | Direct fuel injection (DFI) | |
| Emissions standard | EPA Tier 3 Bin 30, Euro 6d | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Supercharger | Eaton TVS R1740 (1.7L) with electric bypass | |
| Timing system | Dual chain (primary and secondary) | |
| Oil type | GM dexos1 5W-30 | |
| Dry weight | 225 kg |
The LT4's supercharged design provides extreme top-end pull ideal for track use and high-speed performance but requires adherence to 10,000-mile oil change intervals to prevent supercharger bearing and timing chain wear. GM dexos1 5W-30 oil is essential due to its thermal stability and compatibility with the direct injection system. The DFI system demands TOP TIER detergent gasoline to prevent injector clogging. Post-2018 models feature updated supercharger bypass actuators with improved thermal protection; pre-2018 units should be inspected per GM SIB 17124. Catalytic converters require monitoring to avoid thermal degradation from prolonged rich mixtures or misfires.
Oil Specs: Requires GM dexos1 5W-30 specification (GM SIB 17124). Replaces GM 4718M and earlier standards.
Emissions: EPA Tier 3 Bin 30 applies to all 2018–2023 models (EPA File EPA-2015-CHEV-010). California models meet SULEV30 standards.
Power Ratings: Measured under SAE J1349. Output assumes 91 octane fuel (GM TIS Doc. 31804).
General Motors Technical Information System (TIS): Docs 31804, SIB 17124
EPA Certification Database (EPA-2015-CHEV-010)
SAE International: J1349 Engine Power Certification Standards
The Chevrolet LT4 was used across Chevrolet's C7/Alpha platforms with longitudinal mounting and shared architecture with Cadillac variants. This engine received platform-specific adaptations-reinforced cylinder heads in the Corvette Z06 and revised intake tuning in the Camaro ZL1-and from 2018 the facelifted Camaro models adopted the LT4 with updated supercharger actuator and ECU calibration, creating interchange limits. Partnerships allowed Cadillac's CTS-V to use the LT4 with minor calibration differences. All adaptations are documented in OEM technical bulletins.
Locate the engine ID tag on the passenger side cylinder head near the exhaust manifold (GM TIS 31804). The 8th VIN digit indicates engine type ('L' for LT4 series). Pre-2018 models have silver valve covers with black coil packs; post-2018 units use black valve covers with red accents. Critical differentiation from LT1: LT4 has a supercharger and direct injection, while LT1 is naturally aspirated. Service parts require model year verification - supercharger bypass actuators for 2016–2017 models are incompatible with 2018+ due to connector redesign (GM SIB 17124).
The LT4's primary reliability risk is supercharger bypass valve actuator failure in early production models, with elevated incidence in high-temperature and track applications. Internal GM quality reports from 2018 indicated approximately 5% of 2016–2017 units required actuator replacement before 60,000 miles, while NHTSA field reports confirm related SES light entries and driveability complaints. Frequent thermal cycling and high-load driving accelerate connector degradation, making timely inspection and preventive replacement critical.
Analysis derived from General Motors technical bulletins (2015-2023) and NHTSA failure statistics (2016-2024). Repair procedures should follow manufacturer guidelines.
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