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Looking at the head from the chamber side, the true hemispherical shape of the Arias/Shelby heads is revealed. The relatively shallow 74cc chamber is achieved by using a valve angle of 15 degrees (intake), and 16 degrees (exhaust). An alternate chamber design, the Arias/Shelby “Pro Stock” style chamber, is available at 67 cc, and features filled-in quench areas at each side of a figure eight chamber configuration. View Related Article
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