The L8T engine is a 6.6-liter V8 gasoline engine developed by General Motors for heavy-duty trucks. Part of the Gen V small-block family, it delivers around 401 horsepower and 464 lb-ft of torque, offering exceptional durability and towing capability. Featuring a cast-iron block, forged steel crankshaft, and variable valve timing, the L8T is engineered for reliability and strong low-end torque ideal for work trucks and commercial applications.
Features
Tested Engine with Warranty
Hassle-Free Returns Available
Live Customer Support
Direct Fit for Your Vehicle
Description
The L8T engine is a powerful 6.6L Gen V V8 gasoline engine designed by General Motors to deliver exceptional performance and dependability for heavy-duty applications. Built with a cast-iron block and forged steel crankshaft, this engine is engineered for long-lasting durability and high torque output. Producing 401 horsepower and 464 lb-ft of torque, the L8T provides the muscle needed for towing, hauling, and demanding workloads. It features direct fuel injection, variable valve timing (VVT), and modern emission controls, ensuring a balance between power, efficiency, and reliability. Perfect for Chevrolet Silverado HD, GMC Sierra HD, and custom performance builds, the L8T is the ideal choice for drivers seeking a rugged, gas-powered alternative to diesel engines.
L8T fitment requires matching your specific model year and drivetrain. The L8T is specific to the fifth-generation 2020+ Silverado 2500/3500 and Sierra 2500/3500 platform. Our VIN verification confirms the correct L8T for your vehicle before it ships.
HD truck operators comparing a used engine, a remanufactured engine, and an OEM engine for the L8T need reliability above all else. A used GM L8T engine from a verified low-mileage HD truck donor gives you the factory 6.6L gasoline V8 as an OEM engine — the factory 401 hp output, the commercial-grade OHV durability, the factory HD calibration — at a price that gets the work truck back to operational status without rebuild delays. Unlike a remanufactured engine from a reconditioned core, this is a factory-original OEM assembly.
Every used GM L8T 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)
6.6L V8
Fuel Type
Gasoline
Availability
In Stock
Shipping
Nationwide Available
Use Case
Ideal for performance builds, swaps, and replacements
Frequently Asked Questions
What vehicles have the L8T Engine?
The L8T engine powers heavy-duty GM trucks like the Chevrolet Silverado 2500HD and 3500HDand the GMC Sierra 2500HD and 3500HD. It’s also used in some commercial and fleet vehicles for its reliability and towing strength.
Is the L87 engine reliable?
Yes, the L87 engine is known for its reliability, combining strong performance with advanced tech like Dynamic Fuel Management. With proper maintenance, it delivers long-lasting durability and smooth operation in GM trucks and SUVs.
How much horsepower does a L87 engine have?
The L87 engine produces around 420 horsepower and 460 lb-ft of torque. It’s designed for strong towing performance and smooth power delivery in GM’s full-size trucks and SUVs.
Is the L8T a good engine?
Yes, the L8T engine is highly regarded for its durability, torque, and reliability in heavy-duty applications. It’s a solid choice for drivers needing dependable gas power without going diesel.
How much does an L8T engine cost?
The L87 engine can generally cost between $7,800 to $7,900 depending on the trim level and model type.
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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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