Generation III "LS1" Small Block Chevy (1997-2008)

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. For more details about engines, see that engines specific page.

SBC Gen III PCMs

By Displacement

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)

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

5.3L (325ci)

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)

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)

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

* Denotes New Addition

1997

*LS1
Aluminum Block
Corvette

1998

LS1
Aluminum Block
Corvette Camaro Firebird

1999

*LR4	*LM7	LS1	*LQ4
Iron Block	Iron Block	Aluminum Block	Iron Block
Silverado 1500	Silverado 1500/2500	Corvette Camaro Firebird	Silverado HD

2008

.