C5 (97-04)

LS Engine Technical Information

 

Our friends at Nook and Tranny have published a great technical resource for GM LS engines.  We have reprinted the beginning of the article below.  To see more, visit http://www.nookandtranny.com/Info_LSx.php

 

 

LS BASED GEN III DISPLACEMENT INFORMATION

RPO VOL CID CR BORE STROKE BLOCK OE APPLICATIONS
LS1 5.7L 346 10.2:1 3.898″ 3.622″ ALUM 97-04 Corvette, 98-02 Camaro/Firebird, 04 GTO
LS2 6.0L 364 10.5:1 4.000″ 3.622″ ALUM 05-07 Corvette, 05-06 GTO, 07 CTS-V
LS3 6.2L 376 10.7:1 4.065″ 3.622″ ALUM 08-09 Corvette
LS6 5.7L 346 10.5:1 3.898″ 3.622″ ALUM 02-05 Corvette Z06, 04-05 CTS-V
LS7 7.0L 427 11.0:1 4.125″ 4.000″ ALUM 07-09 Corvette Z06
LS9 6.2L 376 9.1:1 4.065″ 3.622 ALUM 09 Corvette ZR1 (Supercharged)
L92 6.2L 376 10.7:1 4.065″ 3.622″ ALUM 07-11 Escalade, 10-11 Silverado/Sierra, 07-11 Yukon Denali, 08 Hummer H2
LQ4 6.0L 364 9.4:1 4.000″ 3.622″ IRON 99-Present Full-Size Trucks
LQ9 6.0L 364 10.1:1 4.000″ 3.622″ IRON Escalade, Silverado SS, Full-Size Trucks
LM4 5.3L 325 9.5:1 3.780″ 3.622″ ALUM 04-Present Full Size Trucks, 04 SSR/Trailblazer/Envoy/Bravada
LM7 5.3L 325 9.5:1 3.780″ 3.622″ IRON 99-Present Full Size Trucks
LR4 4.8L 293 9.5:1 3.780″ 3.267″ IRON 99-Present Full Size Trucks
LSA 6.2L 376 9.0:1 4.065″ 3.622″ ALUM 2009-2011 CTS-V, 2012 Camaro ZL1

All LS based engines have a 9.240 Deck height, unless it’s an LSX block, which is available in a 9.26″ and a 9.70″ deck

LS BLOCK CASTING #’S

MAKE/MODEL CASTING # MATERIAL CID BORE VALLEY PAN HEAD BOLT
LS1 CORVETTE ALUMINUM 346 3.898″ VARIABLE
LS1 CAMARO/FIREBIRD ALUMINUM 346 3.898″ VARIABLE
LS1 CAMARO/FIREBIRD ALUMINUM 346 3.898″ VARIABLE
LS2 CORVETTE/GTO ALUMINUM 364 4.000″ =LENGTH
LS2 CORVETTE/GTO/CTS-V ALUMINUM 364 4.000″ 11-BOLT  =LENGTH

LS SERIES CRANKSHAFT RELUCTORS AND SENSORS

LS based motors use 2 different reluctor rings and sensors (24x and 58x). There are also 3 different bolt patterns for the flywheel/flexplate : 6-bolt, 8-bolt and 9-bolt. Proper orientation of the crank ring is required if switching the reluctors. Below are photos of the orientation of the rings. You will notice on both rings, there are triangular/arrowed windows that align with 2 bolt holes, and the non-windowed portions of the ring cover the crankshaft throw weights. A 24x pickup ring uses a black colored crankshaft sensor, a 58x pickup ring uses a gray colored crankshaft sensor. The connectors are also differently keyed between the 2 sensors.