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Even with the small 64cc chamber, we used the thin Fel-Pro 0.015-inch stamped, rubber-coated head gasket in order to increase the compression ratio. This created an honest 9:1 compression but with a true flat-top piston and a zero deck height (versus the Goodwrench’s 0.025-inch below deck height), a thicker head gasket would pump the compression to over 10:1.
The Goodwrench Quest, Part VI

Even with the small 64cc chamber, we used the thin Fel-Pro 0.015-inch stamped, rubber-coated head gasket in order to increase the compression ratio. This created an honest 9:1 compression but with a true flat-top piston and a zero deck height (versus the Goodwrench’s 0.025-inch below deck height), a thicker head gasket would pump the compression to over 10:1.  View Related Article

 

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