04.5-06 Duramax LLY

The Duramax LLY was introduced in 2004 to replace the popular LB7. Like the LB7, the LLY utilizes a high pressure common rail direct injection system. The LLY was General Motors' first attemp at implementing emission controls on a diesel engine to meet stricter emissions requirements in the future. The LLY adopted a variable geometry turbocharger (VGT) and exhaust gas recirculation (EGR) system to help reduce emissions. Huge changes to the LLY debuted in 2006, but the engines were mechanically identical.

Years Produced 2004.5 - 2006
Displacement 403 cubic inches, 6.6 liters
Configuration 90 degree V8
Compression Ratio 17.5:1 (16.8:1 in 2006)
Bore 4.06 inches
Stroke 3.90 inches
Aspiration • Garrett variable geometry turbocharger (VGT)
• air to air intercooler
Valvetrain OHV, 4 valves per cylinder
Injection • Direct injection
• Bosch high pressure common rail, CP3 injection pump
• 23,000 psi max injection pressure
Horsepower • 310 hp @ 3,000 RPM
• 310 hp @ 3,000 RPM (2006)
Torque • 520 lb-ft @ 1,600 RPM
• 605 lb-ft @ 1,600 RPM (2006)
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