The GM LMP is a 5,328 cc, 90‑degree V8 petrol engine produced between 2007 and 2011. It features a cast iron block, aluminum heads, and overhead valve (OHV) pushrod architecture with variable valve timing (VVT) on the exhaust cam. This Vortec engine delivered 315 hp and 335 lb‑ft of torque, emphasizing low — end grunt and towing capability for full — size truck applications.
Fitted to models such as the Chevrolet Silverado 1500 and GMC Sierra 1500, the LMP was engineered for ru…
All production years (2007–2011) meet U.S. Tier 2 Bin 5 standards (EPA Engine Family Code: 3GAXV05.3LBAK).
The GM LMP is a 5,328 cc 90-degree V8 petrol engine engineered for full-size trucks (2007-2011). It combines OHV architecture with exhaust-only VVT to deliver strong low-RPM torque and rugged durability. Designed to meet U.S. Tier 2 Bin 5 standards, it prioritizes towing capacity and daily reliability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,328 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | 90° V8, OHV, 2 valves per cylinder | |
Aspiration | Naturally aspirated | |
Bore × stroke | 99.0 mm × 86.0 mm | |
Power output | 315 hp (235 kW) | |
Torque | 335 lb-ft (454 Nm) | |
Fuel system | Sequential multi-port fuel injection (SFI) | |
Emissions standard | U.S. Tier 2 Bin 5 | |
Compression ratio | 9.9:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft with VVT actuator | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 458 lb (208 kg) |
The GM LMP was used across GM's GMT900 platform with longitudinal mounting and no external licensing. This engine featured unique accessory brackets and engine mounts for the Silverado versus the Sierra. From 2009, the VVT actuator was revised for improved durability, creating a key service part difference. All adaptations are documented in OEM technical bulletins.
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The LMP's primary reliability risk is exhaust cam VVT actuator failure, with elevated incidence in high-mileage or poorly maintained vehicles. GM internal data indicated a significant number of warranty claims for actuator replacement, while owner reports consistently cite reduced power and check engine lights as common symptoms. Extended oil change intervals and use of incorrect oil viscosity make the updated actuator and strict maintenance critical.
Analysis derived from GM technical bulletins (2007-2011) and NHTSA complaint data (2007-2015). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The LMP is generally a robust and durable engine with a simple OHV design. Its main weakness is the original exhaust cam VVT actuator, which is prone to failure. With the updated actuator installed and proper maintenance (especially oil changes), the LMP can reliably exceed 200,000 miles.
The most frequent issue is the failing exhaust cam VVT actuator, causing reduced power and check engine lights. Other common problems include oil leaks from the valve covers, intake manifold gasket leaks, and spark plug/coil failures. These are well-documented in GM service bulletins.
The LMP 5.3L V8 was used in the Chevrolet Silverado 1500 and GMC Sierra 1500 from 2007 to 2011. It was a key engine for GM's full-size truck lineup during that era, offering VVT for improved efficiency over the base LY5 engine.
Aftermarket ECU tuning is common on the LMP platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy is typical for a 5.3L V8 in a full-size truck. In a 2WD Chevrolet Silverado 1500, expect around 15 mpg city and 21 mpg highway. Real-world combined fuel economy usually falls between 17-18 mpg, heavily influenced by driving conditions and vehicle load.
No. The GM LMP is a non-interference engine. This means if the timing chain were to fail or jump, the pistons will not contact the valves. While a broken chain will still leave you stranded, it prevents catastrophic internal engine damage, making it a more forgiving design.
GM recommends SAE 5W-30 motor oil for the LMP engine. The oil should meet the API SM or SN specification (or a newer equivalent). Regular oil changes every 5,000 miles are crucial for long-term engine health, particularly for the VVT system and timing chain.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
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Type-approval guidance and documentation.
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