Big Boyz Head Porting  


    Twin-Cam Compression and Engine Displacement Calculator  
  Choose Engine Size         
          Use for custom configuration or oversize bore.  Leave at 0.000 to use default values OR change any value to override default.  
  STD Bore  Alternate Bore   
  Stroke  Alternate Stroke   
  Rod Length  Alt Rod Length   
  Head Gasket Thickness   inches Stock=.045, Cometic MLS  .030  or  .040  
  Head Gasket Bore   inches Stock 88, 96=3.850, 95, 98, 103 and 107=3.910  
  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 & Flat tops=-1.0 to -1.5 **  
      10.25:1 SE Cast 95=10.5 to 11.0 **  
      10.5:1 Forged 95=11.5 to 13.0 **  
  Static Compression :1     ** Total volume for 1  
          piston, not both  
  Engine Displacement ci      
  Corrected Compression         
     Cam Offset Degrees **  
  OR      **Applies to both chosen or entered value  
  ** Enter Intake Close ABDC         
  ** (Set to ZERO if using a Selected Cam)        
            Convenience Calculator  
  Altitude Correction        From   
  Feet Above Sea Level      To   
  Corrected Compression :1    
   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.  

** Terms Of Use **

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