Generation IV 5.3L Engines

Introduced in 2005, Generation IV Vortec 5300 engines offer several improvements over their Generation III counterparts.   General Motors currently offers  2 iron block versions (LY5 and LMG) and 2 aluminum block versions (LH6 and LC9). All versions feature the GM Active Fuel Management system, formerly known as displacement on demand.  All Gen-IV 5.3L engines feature drive-by wire throttle control and may require the throttle pedal for the engine to run.

LH6

The aluminum block LH6 is an upgrade for the generation III LM4 first introduced in 2005
It is rated at 320hp and 340ft-lbf of torque from SUV applications.  It is rated 315hp and 338 ft-lbf of torque in pickup applications.
Vehicles containing the LH6 can be identified by the eight digit of the VIN number, which will be “M”.

The LH6 comes in the following applications:
•    2005-2007 Chevrolet TrailBlazer including EXT
•    2005 GMC Envoy XL
•    2005 GMC Envoy XUV
•    2005-2007 Buick Rainier
•    2005-present Saab 9-7X
•    2007 Chevrolet Silverado 1500
•    2007 GMC Sierra 1500

LY5

The iron block LY5 Vortec 5300 is the replacement for the LM7 Generation III engine and was introduced for 2007.  LY5 applications:
It is rated at 320hp and 340ft-lbf of torque from SUV applications.  It is rated 315hp and 338 ft-lbf of torque in pickup applications.
Vehicles containing the LY5 can be identified by the eight digit of the VIN number which will be “J”.

The LY5 comes in the following applications:
•    2007-present Chevrolet Avalanche
•    2007-present Chevrolet Silverado 1500
•    2007-present Chevrolet Suburban 1/2 ton
•    2007-present Chevrolet Tahoe
•    2007-present GMC Sierra 1500
•    2007-present GMC Yukon
•    2007-present GMC Yukon XL 1/2 ton

LMG

The iron block LMG Vortec 5300 is the FlexFuel version of the LY5.
It is rated at 320hp and 340ft-lbf of torque from SUV applications.  It is rated 315hp and 338 ft-lbf of torque in pickup applications.
Vehicles containing the LMG can be identified by the eight digit of the VIN number which will be “0”.

The LMG comes in the following applications:

•    2007-present Chevrolet Avalanche
•    2007-present Chevrolet Silverado 1500
•    2007-present Chevrolet Suburban 1/2 ton
•    2007-present Chevrolet Tahoe
•    2007-present GMC Sierra 1500
•    2007-present GMC Yukon
•    2007-present GMC Yukon XL 1/2 ton

LC9

The aluminum block LC9 Vortec 5300 is the FlexFuel version of the LH6, and is found in 4WD models.
It is rated at 310 hp and 335ft-lbf of torque from SUV applications.  It is rated 315hp and 338 ft-lbf of torque in pickup applications.
Vehicles containing the LC9 can be identified by the eight digit of the VIN number which will be “3”.

The LC9 comes in the following applications:
•    2007-present Chevrolet Avalanche
•    2007-present Chevrolet Silverado 1500
•    2007-present Chevrolet Suburban 1/2 ton
•    2007-present GMC Sierra 1500
•    2007-present GMC Yukon XL 1/2 ton