difference between LQ4 and LQ9
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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.
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