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      
  cc      
           
  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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