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 "wilder" tune, giving it a large increase in power horsepower and torque output.
2006 - 2007.5
403 cubic inches, 6.6 liters
90 degree V8
• Variable geometry turbocharger (VGT) • air to air intercooler • 20 psi maximum boost pressure
OHV, 4 valves per cylinder
• Direct injection, high pressure Bosch common rail injection system, CP3 injection pump • Maximum 26,000 psi injection pressure • Seven hole injectors