This list came from Dave Lucas on Defender Source.  Because of the long (and wandering) treads on many of the forums, we’ve highlighted some key information.

LY6

The LY6 is a is considered the upgrade from it’s generation III LQ4 predecessor, and features variable valve timing.
The LY6 is rated at 325 hp and 370 ft•lbf of torque.
The LY6 can be identified by the 8th digit of the VIN number which will be “K”

LY6 applications:
• 2007-present Chevrolet Silverado HD
• 2007-present GMC Sierra HD
• 2007-present Chevrolet Suburban 3/4 ton
• 2007-present GMC Yukon XL 3/4 ton

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

L92

The 6.2L Vortec 6200 L92 engine is based on an all-aluminum design which feature variable valve timing. The L92 engines feature drive-by-wire throttle control which may require the throttle pedal to run the engine.

This engine produces 403 HP and 417 Ft-lbf of troque in the Cadillac Escalade, and 380 HP and 415 Ft-Lbf of Torque in the GMC Denali.
The L92 can be identified by the 8th digit of the VIN number which will be “8”.
Applications:

The L92 comes in the following vehicles:
• 2007+ Cadillac Escalade
• 2007+ GMC Yukon Denali / Denali XL
• 2007+ GMC Sierra Denali
• 2008+ Hummer H2