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Valve Angle 30 Degree Back Cut

Valve Angle 30 Degree Back Cut

Valve Angle - Make More Horsepower
This 30-degree back-cut idea works so well, even the very popular Vortec iron small-block Chevy head incorporated this 30-degree technique for both the intake and exhaust valves on all production heads. It's one reason this head works so well on mild street small-blocks. View Related Article
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