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{{DISPLAYTITLE:Generation III "LS1" Small Block Chevy (1997-2008)}}
{{DISPLAYTITLE:Generation III "LS1" Small Block Chevy (1997-2008)}}
This Model is part of the [[Small Block Chevy V8]] Family of Engines.
This Model is part of the [[SBC|Small Block Chevy V8]] Family of Engines.


This page is intended to aid in the understanding of the entire Gen III Lineup of engines, and as a guide when attempting to find one in a junkyard.   
This page is intended to aid in the understanding of the entire Gen III Lineup of engines, and as a guide when attempting to find one in a junkyard.   

Latest revision as of 00:25, 3 February 2026

This Model is part of the Small Block Chevy V8 Family of Engines.

This page is intended to aid in the understanding of the entire Gen III Lineup of engines, and as a guide when attempting to find one in a junkyard.

It outlines all of the engines in Chevy's generation 3, both by displacement and year by year. It aims to aid in finding an engine from a junkyard, identifying specific engine models, or teaching the history of Gen 3. For more details about engines, see that engines specific page.

Components

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By Displacement

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The Gen III Lineup consists of nine total engine models, four of which feature an aluminum block (the rest being cast iron).

4.8L (293ci)

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LR4 "Vortec 4800"
Iron Block
1999-2007 - Vin V
  • '99-'07 Silverado 1500
  • '00-'06 Tahoe
  • '03-'07 Express 2500/3500

5.3L (325ci)

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LM7 "Vortec 5300" L59 "Vortec 5300 (Flex Fuel)" LM4 "Vortec 5300" L33 "Vortec 5300 HO"
Iron Block Iron Block Aluminum Block Aluminum Block
1999-2007 - Vin T 2002-2007 - Vin Z 2003-2005 - Vin P 2005-2007 - Vin B
  • 99-'07_Silverado_1500
  • '99-'00 Silverado 2500
  • '00-'06 Suburban 1500
  • '00-'06 Tahoe
  • '03-'07 Express 1500/2500
  • '02-'06 Avalanche 1500
  • '02-'05 Escalade 2WD
  • '02-'07 Silverado 1500
  • '02-'06 Suburban 1500
  • '02-'06 Tahoe
  • '05-'06 Avalanche 1500
  • '03-'05 Trailblazer EXT
  • '03-'04 SSR
  • '04-'04 GMC Envoy XL/XUV
  • '04-'04 Buick Rainier
  • '03-'04 Isuzu Ascender
  • '05-'07 Silverado 1500 4WD

5.7L (346ci)

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LS1 LS6
Aluminum Block Aluminum Block
1997-2005 - Vin G 2002-2007 - Vin S
  • '97-'04 Corvette
  • '98-'02 Firebird
  • '98-'02 Camaro Z28/SS
  • '04-'04 GTO
  • '01-'04 Corvette Z06
  • '04-'05 Cadillac CTS-V

6.0L (364ci)

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LQ4 "Vortec 6000" LQ9 - "Vortec HO 6000/VortecMAX"
Iron Block Iron Block
1999-2007 - Vin U 2002-2007 - Vin N
  • '99-'07 Silverado 1500HD-3500
  • '00-'06 Suburban 1500LTZ/2500
  • '02-'07 Hummer H2
  • '03-'07 Express 2500/3500
  • '03-'08 W-Series
  • '02-'06 Escalade AWD/EXT
  • '03-'06 Escalade ESV
  • '05-'06 Escalade 2WD
  • '03-'07 Silverado SS/HO/VortecMAX
  • '05-'06 Sierra Denali


By Model Year

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* Denotes New Addition

1997

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Aluminum Block
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*LS1
5.7L (346ci)
  • Corvette


1998

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Aluminum Block
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LS1
5.7L (346ci)
  • Corvette
  • Camaro
  • Firebird


1999

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Aluminum Block
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LS1
5.7L (346ci)
  • Corvette
  • Camaro
  • Firebird
Iron Block
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*LR4 *LM7 *LQ4
4.8L (293ci) 5.3L (325ci) 6.0L (364ci)
  • Silverado 1500/2500
  • Silverado 1500/2500
  • Silverado HD


2000

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Aluminum Block
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LS1
5.7L (346ci)
  • Corvette
  • Camaro
  • Firebird
Iron Block
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LR4 LM7 LQ4
4.8L (293ci) 5.3L (325ci) 6.0L (364ci)
  • Silverado 1500/2500
  • *Tahoe
  • Silverado 1500/2500
  • *Suburban 1500
  • *Tahoe
  • Silverado HD
  • *Suburban 1500LTZ/2500


2001

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Aluminum Block
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LS1 *LS6
5.7L (346ci) 5.7L (346ci)
  • Corvette
  • Camaro
  • Firebird
  • Corvette Z06
Iron Block
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LR4 LM7 LQ4
4.8L (293ci) 5.3L (325ci) 6.0L (364ci)
  • Silverado 1500
  • Tahoe
  • Silverado 1500/2500
  • Suburban 1500
  • Tahoe
  • Silverado *2500/HD
  • Suburban 1500LTZ/2500


2002

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Aluminum Block
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LS1 *LS6
5.7L (346ci) 5.7L (346ci)
  • Corvette
  • Camaro
  • Firebird
  • Corvette Z06
Iron Block
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LR4 LM7 *L59 LQ4 *LQ9
4.8L (293ci) 5.3L (325ci) 5.3L (325ci) 6.0L (364ci) 6.0L (364ci)
  • Silverado 1500
  • Tahoe
  • Silverado 1500/2500
  • Suburban 1500
  • Tahoe
  • Silverado 1500
  • Suburban 1500
  • Tahoe
  • Silverado *2500/HD
  • Suburban 1500LTZ/2500
  • Escalade AWD/EXT


2003

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Aluminum Block 5.3 LM4 introduced for Trailblazer EXT and Chevrolet SSR, Silverado SS introduced with LQ9, Express gets LR4, LM7, and LQ4.

Aluminum Block
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*LM4 LS1 LS6
5.3L (325ci) 5.7L (346ci) 5.7L (346ci)
  • Trailblazer EXT
  • Chevrolet SSR
  • Isuzu Ascender
  • Corvette
  • Camaro
  • Firebird
  • Corvette Z06
Iron Block
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LR4 LM7 L59 LQ4 *LQ9
4.8L (293ci) 5.3L (325ci) 5.3L (325ci) 6.0L (364ci) 6.0L (364ci)
  • Silverado 1500
  • Tahoe
  • *Express 2500/3500
  • Silverado 1500/2500
  • Suburban 1500
  • Tahoe
  • *Express 1500/2500
  • Silverado 1500
  • Suburban 1500
  • Tahoe
  • Silverado *2500/HD
  • Suburban 1500LTZ/2500
  • *Hummer H2
  • *Express 2500/3500
  • *W-Series
  • Escalade AWD/EXT
  • *Silverado SS/HO


2004

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GMC Envoy XL/XUV and Buick Rainier get LM4, Pontiac GTO Gets LS1, Cadillac CTS-V Gets LS6

Aluminum Block

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LM4 LS1 LS6
5.3L (325ci) 5.7L (346ci) 5.7L (346ci)
  • Trailblazer EXT
  • Chevrolet SSR
  • Isuzu Ascender
  • *GMC Envoy XL/XUV
  • *Buick Rainier
  • Corvette
  • Camaro
  • Firebird
  • *GTO
  • Corvette Z06
  • *Cadillac CTS-V

Iron Block

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LR4 LM7 L59 LQ4 LQ9
4.8L (293ci) 5.3L (325ci) 5.3L (325ci) 6.0L (364ci) 6.0L (364ci)
  • Silverado 1500
  • Tahoe
  • Express 2500/3500
  • Silverado 1500/2500
  • Suburban 1500
  • Tahoe
  • Express 1500/2500
  • Silverado 1500
  • Suburban 1500
  • Tahoe
  • Silverado 2500/HD
  • Suburban 1500LTZ/2500
  • Hummer H2
  • Express 2500/3500
  • W-Series
  • Escalade AWD/EXT
  • Silverado SS/HO


2005

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Gen4 Debuts, Replaces LS1 and LM4 (Trailblazer EXT gets one more year of LM4). L33 Releases as the only Aluminum Truck Engine. Avalanche gets Flex Fuel. Sierra Denali gets LQ9

Aluminum Block

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LM4 *L33 LS1 LS6
5.3L (325ci) 5.3L (325ci) 5.7L (346ci) 5.7L (346ci)
  • Trailblazer EXT
  • Silverado 1500 4WD
 Replaced By LS2
  • Cadillac CTS-V

Iron Block

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LR4 LM7 L59 LQ4 LQ9
4.8L (293ci) 5.3L (325ci) 5.3L (325ci) 6.0L (364ci) 6.0L (364ci)
  • Silverado 1500
  • Tahoe
  • Express 2500/3500
  • Silverado 1500/2500
  • Suburban 1500
  • Tahoe
  • Express 1500/2500
  • Silverado 1500
  • Suburban 1500
  • Tahoe
  • *Avalanche 1500
  • Silverado 2500/HD
  • Suburban 1500LTZ/2500
  • Hummer H2
  • Express 2500/3500
  • W-Series
  • Escalade AWD/EXT
  • Silverado SS/HO
  • *Sierra Denali


2006

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LS7 Replaces LS6, Silverado VortecMAX introduced. Escalade 2WD drops LM7.

Aluminum Block

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LM4 L33 LS6
5.3L (325ci) 5.3L (325ci) 5.7L (346ci)
Replaced by LH6
  • Silverado 1500 4WD
 Replaced by LS7

Iron Block

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LR4 LM7 L59 LQ4 LQ9
4.8L (293ci) 5.3L (325ci) 5.3L (325ci) 6.0L (364ci) 6.0L (364ci)
  • Silverado 1500
  • Tahoe
  • Express 2500/3500
  • Silverado 1500/2500
  • Suburban 1500
  • Tahoe
  • Express 1500/2500
  • Silverado 1500
  • Suburban 1500
  • Tahoe
  • *Avalanche 1500
  • Silverado 2500/HD
  • Suburban 1500LTZ/2500
  • Hummer H2
  • Express 2500/3500
  • W-Series
  • Escalade AWD/EXT
  • Silverado VortecMAX
  • Sierra Denali


2007

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Tahoe, Suburban, and Avalanche switch to Gen 4.

Aluminum Block

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L33
5.3L (325ci)
  • Silverado 1500 4WD

Iron Block

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LR4 LM7 L59 LQ4 LQ9
4.8L (293ci) 5.3L (325ci) 5.3L (325ci) 6.0L (364ci) 6.0L (364ci)
  • Silverado 1500
  • Express 2500/3500
  • Silverado 1500/2500
  • Express 1500/2500
  • Silverado 1500
  • Silverado 2500/HD
  • Suburban 1500LTZ/2500
  • Hummer H2
  • Express 2500/3500
  • W-Series
  • Escalade AWD/EXT
  • Silverado VortecMAX
  • Sierra Denali


2008

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All Gen 3 Blocks cease production. Remaining stock is used up in W-Series.

Aluminum Block

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L33
5.3L (325ci)
Replaced by LC9


Iron Block

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LR4 LM7 L59 LQ4 LQ9
4.8L (293ci) 5.3L (325ci) 5.3L (325ci) 6.0L (364ci) 6.0L (364ci)
Replaced by LY2 Replaced by LY5 Replaced by LMG
  • W-Series
 Replaced by L92


2009

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All Gen 3 stock depleted.

Iron Block

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LQ4
6.0L (364ci)
Replaced by LY6






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