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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Cognito Stage 1 4-6" Lift Kit (with Bilstein Shocks) 2001-2010 Duramax 6.6L

Chevy and GMC 4-6 Inch non-torsion bar drop Lift Kit Package- 2001-2010 4WD Diesel or Gas engine 3..

$2,305.00

Cognito Stage 1 4-6" Lift Kit (with Bilstein Shocks) 2001-2010 Duramax 6.6L

Chevy and GMC 4-6 Inch non-torsion bar drop Lift Kit Package- 2001-2010 4WD Diesel or Gas engine 1..

$2,500.00

Cognito Stage 1 7-9" Lift Kit (with Bilstein Shocks) 2001-2010 Duramax 6.6L

Chevy and GMC 7 Inch Lift Kit Package- 2001-2010 4WD Diesel or Gas engine 1500HD, 2500HD, 3500HD, ..

$2,580.00

Cognito Stage 1 Leveling Kit (with Fox Shocks) 2001-2010 Duramax 6.6L

Cognito Stage 1 leveling kit with torsion bar keys, front and rear Fox monotube shocks..

$618.80

Cognito Stage 2 Leveling Kit 2001-2010 Duramax 6.6L

Cognito Stage 2 leveling kit, 2001-2010 2 and 4 WD Chevy Silverado and GMC Sierra 2500HD, 3500HD, ..

$679.00

Cognito Stage 3 Leveling Kit (with Fox Shocks) 2001-2010 Duramax 6.6L

Cognito Stage 3 leveling kit with Upper control arms, torsion bar keys, front and rear Fox monotube ..

$1,158.80

Cognito Stage 4 Leveling Kit (with Fox Shocks) 2001-2010 Duramax 6.6L

Cognito Stage 4 leveling kit with Upper control arms, torsion bar keys, front and rear Fox monotub..

$1,398.80

Cognito Tubular Upper Control Arm Kit 2001-2010 Duramax 6.6L

Tubular Upper Control Arm kit - Ball joint style with dual shock mounts built in..

$569.00

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