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Just did a compression test on a 06 GTO ls2 what psi should it be?

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Old 11-12-2008, 05:17 PM
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Default Just did a compression test on a 06 GTO ls2 what psi should it be?
This is on a procharged car went lean So checking the motor out

All cylinders at 200 to 210 psi range good ?

What should they be ?
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Old 11-12-2008, 05:37 PM
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looks healthy, measure all cylinders after 4 compression strokes thats the number you want
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Old 11-12-2008, 06:10 PM
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I did 5 compressions strokes but at 4 it was very close to final number maybe 3-5 psi off
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Old 11-12-2008, 10:18 PM
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That sounds higher than it should be. I thought factory cranking compression should be in the 180 range. My 408 at 12:1 is at 205-210.
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Old 11-13-2008, 06:25 AM
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I have always been told to look for consistency between cylinders as opposed the actual number the guage spits out.
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Old 11-14-2008, 10:28 AM
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That doesnt mean a consistant 140 psi would be ok though
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Old 12-02-2008, 06:59 PM
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depends on the cam
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