Big Boyz Head Porting  


  EVO Compression and Engine Displacement Calculator  
  Bore   inches Stock 80=3.498, 96=3.625    
  Stroke   inches Stock 80=4.250, 96=4.625    
  Rod Length   inches Stock=7.440    
  Head Gasket Thickness   inches Stock=.045, Cometic MLS  .030  or  .040  
  Head Gasket Bore   inches Stock 80=3.600, 96=3.750    
  Cylinder Head Volume   CC's Your measured volume should be entered here  
  Deck Height Front Cyl   inches Negative number if piston     
  Deck Height Rear Cyl   inches is ABOVE cylinder    
  Optional Piston Diameter   inches Measure above top ring**      
        ** Leave Both at Zero OR enter BOTH values  
  Optional Top Ring Land   inches Distance from piston crown to top ring**    
  Piston Dome Volume   CC's Stock 80= -1.5 enter only 1 piston, not both  
  Static Compression      
  Engine Displacement ci      
  Corrected Compression         
      Convenience Calculator  
  OR     From   
  ** Enter Intake Close ABDC         
  ** (Set to ZERO if using a Selected Cam)   To   
  Altitude Correction           
  Feet Above Sea Level         
  Corrected Compression      
   Cold Cranking Compression    
  Values in RED are approximate.  Use actual measured values only.  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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