RPO codes GENERATION IIILS1 - 5.7 (346 CI) - Between 305-350 hp and 335-375 ft·lb1997-2004 Chevrolet Corvette C5, excluding Z061998-2002 Chevrolet Camaro Z28, SS1998-2002 Pontiac Firebird Formula, Trans Am, Trans Am WS62004 Pontiac GTO*97-98 Had Perimeter Bolt Valve CoversLS6 - 5.7 (346 CI) - 385(01 Vette only)/405 hp and 385(01 only)/400 ft-lbs.2001-2004 Chevrolet Corvette C5 Z062004-2005 Cadillac CTS V-Series*Basically the same as an LS1 but with better heads (243 head castings) a more aggressive cam, and LS6 intake manifold make up the power differences.

TRUCK ENGINES - STILL GENERATION III The truck engines are very much like the LS1/LS6 and are still classified as a Gen III engine. They are mainly iron with the exception of the LM4/L33, and as a result weigh approximately 80+ lbs. more. All the parts from the LS series can bolt on to these engines and is recommended for any swap as the accessories and intake manifold usually fit better from an F-body. The 4.8 and 5.3 can both be punched out to a 5.7 (346 Cubic Inches) simply with a bigger bore (the 5.3) or a bigger bore and the 5.3 crank (in the 4.8's case).4.8 - LR45.3 - LM4, LM7, L33, L596.0 - LQ4, LQ9LR4 - 270-295 hp and 285-305 ft·lb*Iron Block2003-present Chevrolet Express 2500-3500/GMC Savana 2500-35001999-2007 Chevrolet Silverado/GMC Sierra1999-2006 Chevrolet Tahoe/GMC YukonLM7 - 285-295 hp 325-335 ft·lb*Most common 3rd gen LSx engine - Iron Block2002-2005 Cadillac Escalade 2WD2002-2006 Chevrolet Avalanche2003-2007 Chevrolet Express/GMC Savana1999-2007 Chevrolet Silverado 15001999-2007 GMC Sierra 15001999-2006 Chevrolet Suburban/GMC Yukon XL1999-2006 Chevrolet Tahoe/GMC YukonLM4 - Identical to the LM7 in power/torque*Aluminum Block, limited production2004 Chevrolet TrailBlazer EXT2004 GMC Envoy XL

2004 Chevrolet SSRL33 - 310 hp - High Output version of the LM7*Aluminum Block2005-2007 Chevrolet Silverado 1500 4WD2005-2007 GMC Sierra 1500 4WDL59 - Flex Fuel version of the LM7 (power/torque same)2002-2007 Chevrolet Silverado 15002002-2006 Chevrolet Tahoe/GMC Yukon2002-2006 Chevrolet Suburban/GMC Yukon XL2002-2007 GMC Sierra 1500LQ4 - 6.0L (364 CI) - 300-325 hp / 360-370 ft·lb*Iron BlockChevrolet Express/GMC SavanaChevrolet Silverado 2500 Pickup, 3500 Pickup, Crew Cab, and Chassis Cab/GMC Sierra 2500 HD Pickup and Crew Cab, C3, Denali, and 3500 Pickup and Chassis Cab, 1500HD Crew CabChevrolet Suburban/GMC Yukon XL DenaliHummer H2 SUTGMC Yukon DenaliLQ9 - 6.0L (364 CI) - 345hp / 380 ft·lb*Iron Block2002-2006 Cadillac Escalade2002-2006 Cadillac Escalade EXT2003-2006 Cadillac Escalade ESV2003-2007 Chevrolet Silverado SS2004-2005 Chevrolet Silverado and GMC Sierra Vortec HO Edition Only 2006-2007 Chevrolet Silverado and GMC Sierra VortecMAX Option

GENERATION IV - Generation IV engines are very similar to Gen III and most parts can be interchanged. The Gen IV was produced with displacement on demand and variable valve timing in mind. Not all have these features, but they are available. Also they have a 58x crank trigger, front cam sensor, and side mounted Knock sensors.L76 - 360hp /385 ft-lbs. 6.0L (364 Cubic Inches)2008 Pontiac G8L98 - 362hp /391 ft-lbs. 6.0L (364 Cubic Inches)2007-2008 Chevrolet Lumina SS2007-2008 Chevrolet Caprice SSL99 - 400hp /395 ft-lbs. 6.0L (364 Cubic Inches)*Derived from the LS3 and with Displacement on Demand2010 Chevrolet CamaroLS2 - 6.0L (364 CI) - 400 hp/400 ft.-lbs.2006-2007 Cadillac CTS-V2005-2007 Chevrolet Corvette

2005-2006 Chevrolet SSR2006-2008 Chevrolet TrailBlazer SS2004-2007 Holden Special Vehicles (all V8 models)2005-2006 Pontiac GTO2008-2010? Saab 9-7X Aero2005-2006 Vauxhall Monaro VXRLS3 - 6.2L (376 CI) - 430 hp / 424 ft.-lbs.April 2008-present Holden Special Vehicles (all V8 models)2008-present Chevrolet Corvette2009 Pontiac G8 GXP2010 Chevrolet CamaroLS4 - 5.3L (325 CI) - 303 hp / 323 ft.-lbs.2006-2008 Chevrolet Impala SS2006-2007 Chevrolet Monte Carlo SS2005-2008 Pontiac Grand Prix GXP2008 Buick LaCrosse Super*Aluminum FWD Block w/ LS6 HeadsLS7 - 7.0L (427 CI) - 505 hp / 470 ft.-lbs.2006-2008 Chevrolet Corvette Z062008 HSV W427LS9 - 6.2L (376 CI) Supercharged - 638 hp / 604 ft.-lbs.*Based on the LS32009 Chevrolet Corvette ZR1

TRUCK ENGINES - GENERATION IVLY2- 4.8 2007-present Silverado/Sierra, Express/Savana , Tahoe/YukonLMG- 5.3 (Iron block/AFM/FF) 2007-present SilveradoLH6- 5.3 (Alum block/AFM) 2005-present TB/Envoy, 2007-present SilveradoLC9- 5.3 (Iron block/AFM/FF) 2007-present SilveradoLY5- 5.3 (Alum block/AFM/FF) 2007-present SilveradoLH8- 5.3 (Alum block) H3 Alpha, Colorado/CanyonLY6 - 6.0 (364 CI) - Same as LQ4, but Gen IV.*Variable Valve Timing2007-present Chevrolet Silverado HD2007-present GMC Sierra HD2007-present Chevrolet Suburban 3/4 ton2007-present GMC Yukon XL 3/4 tonL76 - 6.0 (364 CI) - 367hp / 375 ft.-lbs.*Basically the Gen IV replacement for the LQ9*Variable Cam Phasing & Active Fuel Management2007-present Chevrolet Suburban2007-present Chevrolet Avalanche

2007-present Chevrolet Silverado2007-present GMC Sierra2007-present GMC Yukon XLLFA - 6.0 (364 CI) - 332 hp / 367 ft.-lbs.*Active Fuel Management*Late-intake valve timing system*Higher 10.8:1 compression ratio2008-present Chevrolet Tahoe Hybrid2008-present GMC Yukon Hybrid2009-present Cadillac Escalade Hybrid2009-present Chevrolet Silverado Hybrid2009-present GMC Sierra HybridL92 - 6.2L (376 CI) - 380/403 hp and 403/415 ft.-lbs.2007-08 Cadillac Escalade2008 Chevrolet Tahoe2007-08 GMC Sierra Denali2008 Hummer H22007-09 GMC Yukon Denali/Denali XLL9H- 6.2L (376 CI)2009 Cadillac Escalade2009 GMC Sierra Denali2009 Hummer H22009 GMC Yukon Denali/Denali XL2009 Silverado LTZ, Tahoe LTZ----------------------------------------------------------------------Quick summary of the major engines and their compression ratios and GM part #s:LS1...346c.i. 5.7L 10.19:1 25534322LS6...346c.i. 5.7L 10.46:1 12578104/12562190LR4...293c.i. 4.8L 9.47:1LM4...325c.i 5.3L 9.49:1LM7...325c.i 5.3L 9.49:1 12562201L59...325c.i. 5.3L 9.49:1LQ4...364c.i. 6.0L 9.41:1 12575147/12575148LQ9...364c.i. 6.0L 10.08:1 12499467