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Cylinder Head Porting

In this drawing anything within the circle around each valve has the potential to shroud the valve. Just installing big valves can put the edge of the valve nearer the chamber wall, thus shrouding it further than it may have been stock.
Porting Cylinder Heads - Port or Abort?

In this drawing anything within the circle around each valve has the potential to shroud the valve. Just installing big valves can put the edge of the valve nearer the chamber wall, thus shrouding it further than it may have been stock.  View Related Article

 

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