LBZ Duramax Diesel

Related Topics:

Duramax LB7

Duramax LLY

Duramax LMM

Duramax LML

Allison 1000 Transmission












Return to Duramax Diesel Specs.


6.6L Duramax LBZ






The LBZ replaced the LLY late in the 2006 model year and production continued through 2007. A large bump in output was seen with the introduction of the LBZ. Mechanically, the LBZ is very similar to the 2006 LLY model. The most significant difference between the LLY and LBZ is the computer controls. The LBZ features a much more aggressive tune, giving it a large increase in power horsepower and torque output.



6.6L Duramax LBZ Specs


6.6L Duramax LBZ, 90 degree V8, diesel.

Years Produced:

2006 - 2007

VIN Code:

D (8th digit of VIN)


403 cubic inches, 6.6 liters.

Head/Block Material:

Aluminum cylinder heads, cast iron engine block.

Compression Ratio:

16.8 : 1

Firing Order:



4.06 inches.


3.90 inches.


Turbocharged and intercooled; variable geometry turbocharger (VGT) and air-to-air intercooler. Maximum boost pressure is approximately 20 psi on stock engine.


Direct injection, 26,000 psi Bosch high pressure common rail with CP3 injection pump and 7 hole fuel injectors.


OHV (overhead valve), 4 valves per cylinder.

Oil Capacity:

10 quarts w/ filter.

Engine Weight:

Approx. 835 lbs.

Max Engine Speed:

3,250 rpm.

Emissions Equipment:

Diesel oxidation catalyst (DOC) and exhaust gas recirculation (EGR).

Peak Horsepower:

360 hp @ 3,2000 rpm.

Peak Torque:

650 lb-ft @ 1,600 rpm.


Additional Duramax LBZ Info:

• LBZ applications include the Chevrolet Silverado HD, GMC Sierra HD, Chevrolet Kodiak, GMC Topkick.
• Nicknamed the "hot rod" of Duramax's due to its performance potential in the aftermarket.
• More powerful tuning than the LLY boosts peak horsepower & torque considerably, though the LLY & LBZ are mechanically very similar.
• Cast iron engine block and aluminum cylinder heads.
• Compression was lowered to 16.8:1 for the LBZ.
• Increased piston pin diamter bore & thicker connecting rod "I section" over previous generations.
• Injection pressure increased to 26,000 psi.
• Improved block casting & thicker connecting rods.
• The LBZ was available mated to the Allison 1000 6 speed automatic transmission or ZF650 6 speed manual transmission.
• The LBZ was available from 2006 to 2007 model years (introduced late 2006, phased out in 2007 in favor of the emissions friendly LMM).