PRC 5.3 Stage 2.5
#12
I was talking if they were a 62 cc chambers. Also depends on the piston to deck height and the gasket you're using. Just use this calc and figure it out yourself since everyone's combo is different 
http://cleanandsober.741.com/CompressionCalculator.html

http://cleanandsober.741.com/CompressionCalculator.html
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