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GM Gen III V-8 Cylinder Head Comparison - Gen III Tech

Common Gen III V-8 Engine RPO Packages and Power Output
RPO Description Power Output Comp. Chmbr. Int/Exh.
Displacement HP/Torque Ratio Vol. Port Vol.
Liters (ci) (cc) (cc)
LS1 5.7 (346) car
Corvette 345/340 10.19 67 200/70
Camaro/Firebird 305/335 to 325/350
GTO 350/365
LS6 5.7 (346) car
Corvette 385/385 '01 10.46 65 210/75
405/400 ’02-today
LQ9 6.0 (364) truck/SUV
Escalade & 345/380 10.08 71 210/75
Silverado SS
LQ4 6.0 (364) truck/SUV
GMC/Chevrolet 300/360 to 330/370 9.41 71 210/75
Fullsize
LM4 5.3 (325) truck/SUV
'01 and later 290/325 to 300/335 9.49 61 200/70
Fullsize, ’04 SSR
’04 Trailblazer/Envoy/
Bravada
LM7 5.3 (325) truck/SUV
'99 and later 285/325 to 295/330 9.49 61 200/70
Fullsize
LR4 4.8 (293) truck/SUV
'99 and later 270/285 to 280/290 9.47 61 200/70
Fullsize

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