6.6L V8 L8T

LOW-SPEED
TORQUE PRODUCER

6.6L V8 L8T Engine from GM Powertrain
Horsepower:  401 hp (299kW) @5200 RPM*
Torque:  464 lb-ft (629Nm) @4000 RPM*
Fuel Type:  Regular Gasoline (87 Octane)

6.6L V-8 L8T Features
& Specifications

The L8T is meant for grunt work, thanks to an impressive 464 lb-ft. of peak torque that arrives 200 rpm sooner (and is 22 percent more) than GM’s previous 6.0L V-8 HD gasoline engines. Direct injection technology provides precise fuel control and enables a higher compression ratio that broadens the torque curve and contributes to a power output of 401 hp. This broad torque band provides a stronger feeling of on-demand power at all speeds.

TYPE: 6.6L
DISPLACEMENT: 6554 cc (400 CI)
ENGINE ORIENTATION: Longitudinal
COMPRESSION RATIO: 10.8:1
VALVE CONFIGURATION: Overhead Valves
VALVES PER CYLINDER: Two
ASSEMBLY SITE: Tonawanda, NY
VALVE LIFTERS: Hydraulic Roller
FIRING ORDER: 1-8-7-2-6-5-4-3
BORE X STROKE: 103.25 x 98.0 mm
FUEL TYPE: Regular Gasoline (87 Octane)
HORSEPOWER: 401 hp (299kW) @5200 RPM*
TORQUE: 464 lb-ft (629Nm) @4000 RPM*
MAXIMUM ENGINE SPEED: 5600 RPM
EMISSIONS CONTROL: Catalytic Converter, Three-way catalyst, Positive Crankcase Ventilation
BLOCK: Cast Iron
CYLINDER HEAD: Cast Aluminum
INTAKE MANIFOLD: Composite
EXHAUST MANIFOLD: Stainless Steel
MAIN BEARING CAPS MATERIAL: Cast Nodular
CRANKSHAFT: Forged Steel
CAMSHAFT: Billet Steel
CONNECTING ROD: Forged Powder Metal
*As tested in Chevrolet Silverado Heavy-Duty

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This contact form is intended for current and prospective U.S. and international business customers in search of GM engine and/or transmission solutions. If you are looking for parts, service, or GM vehicle support, please click here.

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