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Valve degrees vary accouding to the manufacturer of the engine. Specs are givien for each engine in a manual that displays valve timeing and valve degree of angle. This is importan because the valve angle must match the head angle already cut into the head by the manufacturer. I have seen everything from 12 degrees to 45 degrees and sometimes multiple degrees. It is according as to what you want the valve to do. More top end speed, less top end speed double fire, tripple fire, advance and retard mechanisms and other factors.

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