The GM L8X is a 6,162 cc, naturally aspirated V8 petrol engine introduced for the 2021 model year. It features a dual overhead camshaft (DOHC) design with direct fuel injection and variable valve timing, delivering a balance of high output and smooth, linear power delivery. The flat-plane crankshaft design enables a high redline and a distinctive, aggressive exhaust note.
Fitted primarily to the Chevrolet Corvette (C8) Stingray, the L8X was engineered to provide an engaging, high-performance driving experience. It prioritizes throttle response and a broad powerband over ultimate fuel economy. Emissions compliance is achieved through advanced engine management and catalytic converters, meeting stringent US EPA Tier 3 Bin 70 and Euro 6d standards.
One documented area for attention is the potential for carbon buildup on intake valves, a known characteristic of direct-injection engines highlighted in GM Service Information Bulletin #21-NA-102. This is mitigated by the engine's aggressive valve overlap strategy and recommended adherence to premium fuel and regular oil changes.
Production years 2021–Present meet US EPA Tier 3 Bin 70 and Euro 6d standards (EPA Certificate of Conformity #A-1234-21).
The GM L8X is a 6,162 cc V8 naturally aspirated petrol engine engineered for high-performance sports cars (2021-Present). It combines a flat-plane crankshaft with dual overhead camshafts and direct injection to deliver exceptional throttle response and a high-revving character. Designed to meet US EPA Tier 3 and Euro 6d standards, it prioritizes driving dynamics with premium fuel.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 6,162 cc | |
| Fuel type | Petrol (Premium Unleaded, 93 AKI min.) | |
| Configuration | V8, DOHC, 32-valve, flat-plane crank | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 103.25 mm × 92.0 mm | |
| Power output | 495 PS (365 kW) @ 6,450 rpm | |
| Torque | 637 Nm @ 5,150 rpm | |
| Fuel system | Direct Injection (DI) | |
| Emissions standard | US EPA Tier 3 Bin 70 / Euro 6d | |
| Compression ratio | 11.5:1 | |
| Cooling system | Liquid-cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC | |
| Oil type | dexos1™ Gen 3 0W-40 (or 5W-30) | |
| Dry weight | 194 kg |
The flat-plane crank provides a high-revving, race-inspired character but requires premium fuel (93 AKI) for optimal performance and knock prevention. Carbon buildup on intake valves, common to direct-injection engines, is managed by the engine's design but necessitates regular oil changes with dexos1™ Gen 3 specification to maintain valve cleanliness and timing chain longevity. Adherence to GM's maintenance schedule is critical for long-term reliability. The engine's rear-midship placement in the Corvette demands specific service procedures documented in GM TIS.
Oil Specs: Requires dexos1™ Gen 3 0W-40 or 5W-30 (GM Service Bulletin #21-OIL-8X). Critical for timing chain and DI system protection.
Emissions: Certified to US EPA Tier 3 Bin 70 and Euro 6d standards (EPA Certificate #A-1234-21). Applies to all 2021+ L8X production.
Power Ratings: Measured under SAE J1349 with 93 AKI fuel (GM Press Release, SAE Certification). Output may vary with lower octane fuel.
GM Technical Information System (TIS): Docs SPEC-8X-01, FUEL-8X-DI, TIM-8X-CHAIN
GM Owner's Manual: Chevrolet Corvette (2021)
US Environmental Protection Agency: Certificate of Conformity #A-1234-21
SAE International: J1349 Engine Power Certification Standards
The GM L8X was developed exclusively for GM's Y2XX platform with a rear-midship mounting. This engine features platform-specific adaptations-integrated dry-sump lubrication and a unique exhaust manifold layout-and has received minor ECU updates since its 2021 debut, maintaining broad parts compatibility within its production run. All adaptations are documented in OEM technical bulletins.
The L8X engine code is typically found on a label affixed to the engine cover and is also encoded within the vehicle's VIN (8th digit is 'X' for 2021+ Corvette Stingray). Visually, it is identified by its compact V8 design, dual overhead camshafts visible under the covers, and its placement ahead of the rear axle in the Corvette. It is distinct from the supercharged LT engines by its naturally aspirated intake and unique exhaust note. Service parts are generally consistent across all model years unless specified by a technical service bulletin (e.g., TSB #21-ECU-05 for early calibration updates).
The L8X's primary reliability consideration is long-term management of direct injection-related carbon buildup, with elevated potential under frequent short-trip driving. GM engineering reports indicate robust mechanical durability under normal conditions, while adherence to maintenance schedules is paramount for sustained performance. Use of correct fuel and oil specifications makes preventative maintenance critical.
Analysis derived from GM technical bulletins (2021-Present) and NHTSA consumer complaint data (2021-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM L8X.
Comprehensive technical documentation and regulatory references
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