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Sonny's 5.000-inch symmetrical Pro Series heads have a 13-degree-angle valve with a 74 to 75cc combustion chamber.
Sonny's Racing Engines Big-Block Build - Max Effort

 Sonny's 5.000-inch symmetrical Pro Series heads have a 13-degree-angle valve with a 74 to 75cc combustion chamber.  View Related Article

 

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