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Cylinder Head Porting

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In as-cast form, many heads have guide bosses as seen here. These are an impediment to flow above about 200 thousandths lift.
Porting Cylinder Heads - Port or Abort?

 In as-cast form, many heads have guide bosses as seen here. These are an impediment to flow above about 200 thousandths lift.  View Related Article

 

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