Specifications
The LM7 Engine is a 5.3L (325 cu in) iron-block V8 from GM’s Gen III LS-based small-block family, commonly known as the Vortec 5300. Produced from 1999 to 2007, it was widely used in Chevrolet and GMC trucks and SUVs, including the Silverado, Sierra, Tahoe, and Suburban. The LM7 features a pushrod OHV design, aluminum cylinder heads, and sequential fuel injection, producing approximately 270–295 horsepower with strong torque output.
The LM7 engine is renowned for its durability, reliability, and affordability, the LM7 is a popular choice for daily drivers and budget performance builds, with excellent aftermarket support and compatibility with common LS upgrades such as cam swaps, improved heads, and forced induction. The LM7 5.3L V8 is used in Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Tahoe, and Chevrolet Suburban 1500, offering reliable power, strong torque, and compatibility with LS upgrades for daily driving and performance builds.
Compatible Models
Chevrolet Silverado 1500
The Chevrolet Silverado 1500 equipped with the LM7 5.3L V8 features a 5.3-liter (325 cu in) iron-block V8 engine with aluminum cylinder heads and a pushrod OHV design. It uses sequential fuel injection, producing approximately 270–295 horsepower with strong low-end torque. This configuration provides a reliable balance of towing capability, everyday drivability, and durability, making it ideal for work or daily use. The LM7’s simple LS-based architecture ensures easy maintenance and excellent aftermarket support for upgrades.
GMC Sierra 1500
In the GMC Sierra 1500, the LM7 5.3L V8 maintains the same iron-block V8 layout with aluminum heads, pushrod OHV design, and sequential fuel injection. Its robust torque curve supports hauling and towing demands, while the LS-based design guarantees reliability and longevity. With a displacement of 5.3 liters, the engine provides smooth, consistent power for both work and everyday driving, along with cost-effective ownership and compatibility with LS-series performance upgrades.
Chevrolet Tahoe
The Chevrolet Tahoe pairs the LM7 5.3L V8 with SUV practicality. The engine configuration includes an iron-block V8, aluminum heads, OHV pushrod valvetrain, and sequential fuel injection, producing 270–295 hp with strong torque. This setup delivers smooth power delivery, dependable towing capability, and respectable fuel efficiency for a full-size V8 SUV, making it suitable for family transport, recreational driving, and long-distance trips while ensuring durability over time.
Chevrolet Suburban 1500
For the Chevrolet Suburban 1500, the LM7 5.3L V8 configuration provides an iron-block 5.3-liter V8 with aluminum cylinder heads, pushrod OHV design, and sequential fuel injection. Its high torque output supports heavy passenger loads and towing requirements, while the reliable LS-based design ensures long-term durability. This configuration makes the Suburban a capable and long-lasting family or utility vehicle, suitable for high-mileage use and versatile driving conditions.
Frequently Asked Questions
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Which vehicles use the GM LM7 Engine?
Common in 2001–2007 Chevy Silverado, GMC Sierra, Tahoe, and Suburban models.
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Can the LM7 engine handle performance upgrades?
Yes, it is swap-friendly and compatible with LS performance mods, T56 transmissions, and crate engines.
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Is this engine used or rebuilt?
All engines are tested used to ensure OEM-level reliability
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How much horsepower and torque does it produce?
295–310 hp and 330–335 lb-ft of torque, depending on year and variant.
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Does it come with a warranty?
Yes, every GM LM7 Engine comes warranty-backed for peace of mind.
GM LM7 Engine
