6.6L V-8 L8T
LOW-SPEED TORQUE PRODUCER
HORSEPOWER: 401 HP (299 KW) @5200 RPM*
TORQUE: 464 LB-FT (629 NM) @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 V-8
Displacement:
6564 cc (400 CI)
Engine Orientation:
Longitudinal
Compression Ratio:
10.8:1
Valve Configuration:
Overhead Valves
Valves per Cylinder:
Two
Assembly Sites:
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 (299 kW) @5200 RPM*
Torque:
464 lb-ft (629 Nm) @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:
Cast Nodular
Crankshaft:
Forged Steel
Camshaft:
Billet Steel
Connecting Rod:
Forged Powder Metal
*As tested in Chevrolet Silverado Heavy-Duty