http://www.nipponpower.com/engine/gasket/cometic.html
Enter your setup into this calculator and figure out what gasket thickness will get you to your target c/r:
http://www.c-speedracing.com/howto/c...c/compcalc.php
Your OEM gasket should be about 0.029-0.030", and Cometic gaskets are available in 0.025, 0.030, 0.040, 0.054, 0.067, 0.078, 0.098, and 0.120. For example, a 0.054" gasket would yield a c/r of about 11.2:1