difference between LQ4 and LQ9

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12-04-2005, 07:36 PM

#11

Black Nali

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The LQ4 is only found in 3/4ton HD trucks and other heavy vehicles.

It also came in the 1/2 ton 1500 platform Sierra Denali / C3.

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12-04-2005, 08:20 PM

#12

99Silver6.0

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Quote:

Originally Posted by whitt1

The LQ4 and LQ9 both use the same 317 cylinder head and the same cam.The LQ9 has a 10:1 compression ratio while the LQ4 is 9.4:1,the main difference in power is the PCM tuning and exhaust systems packaged with the the different applications.With just a engine swap and equal tuning there's probably not a 10hp difference.

Yeppers. There was 2 different LQ4 apps. One at 300HP and one at 325.