6.6L V-8 L5P Duramax® Turbo-Diesel


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Horsepower:  445 hp @ 2800 rpm*
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Torque:  910 b-ft @ 1600 rpm*
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Cylinders:  8
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6.6L L5P Duramax Turbo-diesel Engine from GM Powertrain

6.6L V-8 L5P Features
& Specifications

This next-generation redesign offers more horsepower and torque than ever — an SAE-certified 445 horsepower (332 kW) and net 910 lb.-ft. (1,234 Nm) — to enable easier, more confident hauling and trailering. Higher boost pressure from the turbocharger, compared to the previous engine, helps the L5P produce more power.

Along with a 19 percent increase in max torque over the current Duramax 6.6L, the redesigned turbo-diesel’s performance is quieter and smoother, for greater refinement. In fact, engine noise at idle is reduced 38 percent.

Type 6.6L V-8 L5P Turbo-Diesel
Displacement 403 ci
Compression Ratio 16.0:1
Valve Configuration Overhead
Valves Per Cylinder 4
Assembly Site Moraine, Ohio
Valve Lifters Mechanical roller
Firing Order 1 - 2 - 7 - 8 - 4 - 5 - 6 - 3
Bore x Stroke 103 x 99 mm
Fuel System DI with high-pressure common rail
Fuel Type Ultra-Low Sulfur Diesel and B20 Biodiesel
Maximum Powered Speed 3450 rpm
Maximum Braking Speed 4800 rpm
Emissions Controls Cooled Exhaust Gas Recirculation (EGR), Selective Catalytic Reduction (SCR), Diesel Particulate Filter (DPF), Intake throttle
Horsepower 445 hp (322 kW) @ 2800 rpm*
Torque 910 lb-ft (1234 Nm) @ 1600 rpm*
Block Cast iron
Cylinder Head Cast aluminum
Intake Manifold Cast aluminum
Exhaust Manifold Cast nodular iron with steel pipe extension
Main Bearing Caps Cast nodular iron
Crankshaft Forged steel
Camshaft Steel
Connecting Rods PM iron
Engine Oil Capacity 10qt/9.5L
*As tested in the Chevrolet Silverado Heavy Duty and GMC Sierra Heavy Duty.