transamsam98

iTrader: (56)

is it an ls motor? also is it worth modifying? I have a friend with a wreched tahoes so please let me know.

bjamick

iTrader: (31)

Ya alot of people put those motors in different cars, bc they are LSx based motors. They run very well also.

transamsam98

iTrader: (56)

thank you

radkon

iTrader: (2)

They are LS based but are IRON block with the exception of the LM4 and L33 in 2004-2005.

LM7
The LM7 Vortec 5300 was introduced in 1999, and can be considered the "garden variety" version of the Generation III 5.3 liter V8's.

LM7 applications:

2002-2005 Cadillac Escalade 2WD
2002-2006 Chevrolet Avalanche
2003-2007 Chevrolet Express/GMC Savana
1999-2007 Chevrolet Silverado 1500
1999-2007 GMC Sierra 1500
1999-2006 Chevrolet Suburban/GMC Yukon XL
1999-2006 Chevrolet Tahoe/GMC Yukon

LM4
The LM4 was an aluminum block version of the LM7, and had a short production life. It should not be confused with the L33.

LM4 applications:

2004 Chevrolet TrailBlazer EXT
2004 GMC Envoy XL
2004 Chevrolet SSR

L33
The L33 was an aluminum block version of the LM7, and was referred to as the Vortec 5300 HO in marketing materials. Power increased by 15 hp (11 kW), to 310 hp (230 kW), over the LM7, and torque was unchanged. It was only available on extended cab 4WD pickup trucks.

L33 applications:

2005-2007 Chevrolet Silverado 1500 4WD
2005-2007 GMC Sierra 1500 4WD