for 2006. It features high-compression (10:1) flat-top pistons for an extra and , bringing output to and . LQ9 came exclusively with 4.10 gears. LQ9s are built only in Romulus, Michigan. 2002–2006 Cadillac Escalade AWD 2006 Cadillac Escalade 2WD 2002–2006 Cadillac Escalade EXT 2003–2006 Cadillac Escalade ESV 2003–2007 Chevrolet Silverado SS 2004–2006 Chevrolet Silverado and GMC Sierra Vortec HO Edition, Silverado/Sierra Performance Edition 2005–2006 GMC Sierra Denali and Yukon Denali 2007 Chevrolet Silverado and GMC Sierra Classic VortecMAX & Silverado/Sierra Performance Edition Generation IV (2005–2020) In 2004, Generation III was superseded by the Generation IV. This category of engines has provisions for high-displacement ranges up to and power output to . Based on the Generation III design, Generation IV was designed with displacement on demand in mind, a technology that allows every other cylinder in the firing order to be deactivated. It can also accommodate variable valve timing. A 3 valves per cylinder design was originally slated for the LS7, which would have been a first for a GM pushrod engine; but the idea was shelved owing to design complexities and when the same two-valve configuration as the other Generation III and IV engines proved to be sufficient to meet the goals for the LS7. 4.00 in. bore blocks (2005–present) This family of blocks was the first of the generation IV small block with the LS2 being the progenitor of this family and generation. This family of blocks has seen a wide range of applications from performance vehicles to truck usage. 6.0 L The Generation IV 6000 is a V8 engine that displaces from bore and stroke of . It features either a cast iron or aluminum engine block with cast aluminum heads. Certain versions feature variable cam phasing, Active Fuel Management, and Flex-fuel capability. LS2 LS2 can also refer to the 1973–1974 Super Duty Pontiac V8 engine LS2 can also refer to the 1985 Oldsmobile Diesel V6 engine. The LS2 was introduced as the Corvette's new base engine for the 2005 model year. It also appeared as the standard powerplant for the 2005–2006 GTO. It produces at 6000 rpm and at 4400 rpm from a slightly larger displacement of . It is similar to the high-performance LS6, but with improved torque throughout the rpm range. The LS2 uses the "243" casting heads used on the LS6 (although without the sodium-filled valves), a smaller camshaft, and an additional . The