The LQ9 engine, also known as the Vortec HO 6000, is a high-output 6.0L V8 designed for performance and durability. Originally built for GM’s performance trucks and SUVs, this engine delivers robust horsepower and torque, making it a popular choice for high-performance swaps and rebuilds. With strong internals and proven reliability, the LQ9 balances power with long-term dependability.
The LQ9 is a 6.0-liter V8 engine from General Motors’ Gen III small-block family, known for its balance of power and durability. It features a cast iron block with aluminum heads, a bore and stroke of 4.00 x 3.62 inches, and a higher compression ratio of 10.1:1 compared to its sibling LQ4. Producing around 345 horsepower and 380 lb-ft of torque, the LQ9 uses a slightly more aggressive camshaft and flat-top pistons for improved performance.
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Description
The LQ9 Engine is a 6.0-liter (364 cu in) V8 engine from GM’s Generation III LS family, producing 345 horsepower and 380 lb-ft of torque in its factory configuration. Designed with an iron block and aluminum heads, it features flat-top pistons, a 10.0:1 compression ratio, and high-flow cathedral port cylinder heads for improved combustion efficiency. The LQ9 uses sequential fuel injection and coil-near-plug ignition for optimized fuel delivery and spark control.
Built for high-performance applications, it includes a reinforced crankshaft, upgraded connecting rods, and a durable camshaft profile that provides strong mid-range power. This engine is compatible with a wide range of GM vehicles and is a favorite among enthusiasts for performance builds, hot rods, and restomods. It runs on premium unleaded fuel and pairs well with both manual and automatic transmissions.
LQ9 fitment requires matching your specific application and model year. The Escalade application differs from the H2 and Silverado applications in oil pan and accessory configurations. Our VIN verification confirms the correct LQ9 for your vehicle before it ships.
GM truck and SUV owners comparing a used engine, a remanufactured engine, and an OEM engine for the LQ9 will find the used OEM route delivers factory 345 hp specifications most directly. A used GM LQ9 engine from a verified low-mileage donor gives you the factory higher-compression 6.0L iron-block as an OEM engine — the factory revised cam profile, the factory 345 hp output — at a price that no remanufactured engine from a standard LQ4 core can match for LQ9-specification accuracy. Choosing a used LQ9 OEM engine preserves the factory performance advantage this engine was specifically built to deliver.
Every used GM LQ9 engine ships with up to a 90-day warranty and arrives within 2 to 5 business days. Installation is not included. These are genuine GM OEM engines, and we stand behind every unit.
Specifications
Product Type
Engine
Displacement (Engine Size)
6.0L V8
Fuel Type
Gasoline
Availability
In Stock
Shipping
Nationwide Available
Use Case
Ideal for performance builds, swaps, and replacements
Frequently Asked Questions
How much does a lq9 engine weigh?
The LQ9 engine can weigh between 464 to 486 pounds, depending on the engine type and model year.
What did the lq9 engine come in?
The LQ9 engine came in heavy-duty GM trucks and SUVs, including the Chevrolet Silverado 2500/3500, GMC Sierra 2500/3500, Suburban 2500, Yukon XL 2500, and Chevrolet/GMC vans. It was mainly used from 2000 to 2007.
How much does a LQ9 engine weigh?
The LQ9 engine can weigh around 486 pounds depending on specific components and configuration.
What cars have lq9 engine?
The LQ9 engine was used in GM heavy-duty trucks and SUVs like the Chevrolet Silverado 2500/3500, GMC Sierra 2500/3500, Suburban 2500, and Yukon XL 2500. It was also in Chevrolet Express and GMC Savana vans.
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Shipping Policy
Our shipping policy is flexible, as the shipping charges depend on the location. A few certain remote regions like CO, UT, NY, OR, & CA may have additional shipping charges or delivery fees. However, some circumstances may cause delays, but we always strive to deliver your order as quickly as possible.
Please note that all shipping times are estimates and not guaranteed. We examine all rebuilt and used engines before shipment and aim to provide high-quality used engines and transmissions. Shipping details and fees will be disclosed to consumers before any transactions are made. Our team is operational 24/7, and you can call us at +1-888-799-0188 to place an order.
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