Big Boyz Head Porting  


  Piston Speed and Acceleration Calculator  & Valve Open Time Calculator  
  **Stroke   inches  TC88=4.000, TC96=4.385    
  Crankshaft Speed   RPM's      
  Mean Piston Speed   Ft./Min      
  **Connecting Rod Length   inches  TC=7.667, Evo=7.440    
  Piston Acceleration   Ft./Sec^2      
  Valve Duration   Degrees      
  Valve Open Time  Seconds      
  ** Effects Graph          
  This calculator is supplied as a convenience and intended to be used for estimates only.  We make no warranties, implied or expressed, to the accuracy of any data or calculations presented here.    
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