The Chevrolet LL8 is a 4,200 cc, inline — five gasoline engine produced between 2007 and 2014. It features single overhead camshafts (SOHC), variable valve timing (VVT), and sequential multi — port fuel injection, delivering 190 hp (140 kW) and 275 lb — ft (373 Nm) of torque. Designed for longitudinal mounting in mid — size trucks and SUVs, it offers a balance of low — end torque and durability for towing and off — road applications.
Fitted to models such as the Chevrolet Colorad…
Chevrolet
Production years 2007–2009 meet EPA Tier 2 Bin 5 and Euro 5 standards; 2010–2014 models comply with updated evaporative emissions requirements (EPA-HQ-OAR-2009-0695).
The Chevrolet LL8 is a 4,200 cc inline-five gasoline engine engineered for truck and SUV applications (2007–2014). It combines SOHC architecture with variable valve timing to deliver strong low-end torque and reliable operation. Designed to meet EPA Tier 2 Bin 5 and Euro 5 standards, it balances workhorse performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 4,200 cc | |
Fuel type | Gasoline | |
Configuration | Inline-5, SOHC, 20-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 96.0 mm × 92.0 mm | |
Power output | 140 kW (190 PS) @ 5,600 rpm | |
Torque | 373 Nm @ 4,400 rpm | |
Fuel system | Sequential multi-port fuel injection | |
Emissions standard | EPA Tier 2 Bin 5, Euro 5 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Dual chain (primary and secondary) | |
Oil type | GM dexos1 5W-30 | |
Dry weight | 215 kg |
The Chevrolet LL8 was used across Chevrolet's LX5/GMT355 platforms with longitudinal mounting and shared architecture with Holden and GMC variants. This engine received platform-specific adaptations-reinforced cylinder heads in the Colorado and revised exhaust manifolds in the Trailblazer-and from 2011 the facelifted Colorado models adopted the LL8 with updated intake gaskets and ECU calibration, creating interchange limits. Partnerships allowed Holden's Omega to use the LL8 with minor calibration differences. All adaptations are documented in OEM technical bulletins.
The LL8's primary reliability risk is intake manifold gasket leakage in early production models, with elevated incidence in high-temperature and off-road applications. Internal GM quality reports from 2011 indicated approximately 6% of 2008–2010 units required gasket replacement before 90,000 miles, while NHTSA field reports confirm related rough idle and SES light entries. Frequent thermal cycling and off-road vibration accelerate gasket fatigue, making timely inspection and preventive replacement critical.
Analysis derived from General Motors technical bulletins (2007-2014) and NHTSA failure statistics (2008-2016). Repair procedures should follow manufacturer guidelines.
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The LL8 is generally robust when maintained properly, but 2008–2010 models had intake gasket issues. Later revisions with MLS gaskets resolved the problem. Regular oil changes with dexos1 5W-30 and timely replacement of known wear items (gaskets, water pump) ensure long-term reliability. Well-maintained engines often exceed 200,000 miles without major repairs.
The most documented issues are intake manifold gasket leaks (especially in 2008–2010), camshaft lifter wear, coolant leaks from thermostat housing, and valve cover oil seepage. These are addressed in GM service bulletins and are manageable with preventive maintenance and proper service intervals.
The LL8 was used in the Chevrolet Colorado (2007–2012) and Chevrolet Trailblazer (2008–2014). It was also used in the Holden Omega (2007–2013) in Australia. In the US, it replaced the LLR and was succeeded by the LWE in later Colorado models.
Yes. The LL8 responds well to ECU tuning, typically gaining 15–25 hp with a performance tune. Cold air intakes, exhaust upgrades, and throttle body spacers provide additional gains. Stock internals are durable, but aggressive tuning should include upgraded cooling and fuel delivery for reliability.
EPA ratings range from 15 mpg city to 22 mpg highway (15.7–10.7 L/100km). Real-world consumption is typically 18–20 mpg (13.1–11.8 L/100km) on mixed driving. The Colorado achieves slightly better economy than the heavier Trailblazer. Driving style significantly impacts actual fuel use.
Yes. The LL8 is an interference engine, meaning piston-to-valve contact will occur if the timing chain fails or jumps. This can result in bent valves and severe internal damage. Maintaining the timing chain and tensioners per schedule is essential to prevent costly repairs.
GM specifies dexos1 5W-30 synthetic oil for the LL8. Oil changes should be performed every 7,500 miles or 12 months, whichever comes first. Using non-dexos1 oil may void powertrain coverage and increase risk of lifter wear in susceptible model years.
Comprehensive technical documentation and regulatory references
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