Cylinder head flatness, to check
 
  
 
 
  
   
    
     |  | Cylinder head flatness, to check | 
   
  
  
   
   
   
   
   
    
     
      
       | 1. | Clean the cylinder head sealing surfaces. 
 
   
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       | 2. | Using a straight-edge and feeler gauge, measure the cylinder head diagonally from corner to corner, as well as lengthwise and crosswise, to check for warping. 
 
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