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73-87 Chevy _ GMC Trucks => Performance => Topic started by: 1973 500 on December 05, 2003, 04:46:00 PM
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I own a 1979 K10 with a 400 small block. From what I could find, it would have a compression ratio of 8.5:1 from the factory, and 642 heads with 78cc combustion chambers. I want to bump compression for more power. Wouldn't 64cc combustion chambers put me up around 9.9:1?