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0602phr 05 Back Cutting Valves Z

The other half of the valvejob is the valves themselves. Flow is nearly always improved with back-cutting the valves, especially at lower lifts. A 30-degree back angle behind the 45-degree face is the norm.
Port Any Head -- Technical Article -- Engine Masters

The other half of the valvejob is the valves themselves. Flow is nearly always improved with back-cutting the valves, especially at lower lifts. A 30-degree back angle behind the 45-degree face is the norm.  View Related Article

 

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