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Compression ratio By Jeff - 04/20/2004 7:50:32 AM; IP 216.170.136.160 I am considering a set of flat top pistons for my 427 that call for a 10.6:1 compression ratio with a 73cc combustion chamber. I am using the Edelbrock alum. heads that have a 76cc combustion chamber. How much does this lower the compression ratio? Thanks for your help.

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Skip Navigation Links. Compression ratio -- Jeff, 04/20/2004  All else equal, I'd say a ~4% 'cc' increase = ~4% c/r drop. [n/m] -- Mr F, 04/24/2004

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