Originally Posted by BrianDB1
Actually not true...
With stock bore & 3 layer head gasket (L = Layer):
Pistons...............1L.... |....2L... |... 3L
JDM B16 PR3's = 10.8:1 | 11.3:1 | 11.6:1
USDM B16 P30's = 11.0:1 | 11.6:1 | 11.9:1
JDM B16B PCT's = 11.7:1 | 12.0:1 | 12.3:1
USDM GSR P72's = 9.8:1 | 10.0:1 | 10.2:1
JDM GSR P72's = 10.1:1 | 10.6:1 | 10.8:1
USDM ITR P73's = 10.5:1 | 10.8:1 | 11.1:1
JDM ITR P73's = 11.0:1 | 11.4:1 | 11.7:1
First off, your compression numbers are wrong. 2nd, they are displayed in your little chart backwards. A thinner headgasket will yield higher compression, not the other way around.
With USDM ITR pistons in your LS, you'll be at 10.8:1 compression...perfectly ok for pump gas. With the right tuning, I've seen 12:1 compression on 91 octane safely, daily driven.
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