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Valve sizes are 2.02/1.60-inch intake and exhaust with a small 64cc combustion chamber volume. For the Goodwrench motor, this turned out to create 9:1 compression. With a zero deck height and true flat-top, four-eyebrow pistons, the compression would jump to 10.25:1.
The Goodwrench Quest, Part VI

 Valve sizes are 2.02/1.60-inch intake and exhaust with a small 64cc combustion chamber volume. For the Goodwrench motor, this turned out to create 9:1 compression. With a zero deck height and true flat-top, four-eyebrow pistons, the compression would jump to 10.25:1.  View Related Article

 

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