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    Valve Timing  
    via centerlines  
    calculator  
     
    copyright 2010   Intake Duration  
        Exhaust Duration  
     
        Intake centerline  
        Exhaust centerline  
     
    intake opens degs exhaust closes degs  
    before TDC   after TDC  
     
         		  
    intake closes degs exhaust opens degs  
    after BDC   before BDC  
      Note: Negative timing indicates
      if valve timing is not updated   opposite of before or after DC
      click update button  
      below  
     
     
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