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Cylinder Head Cleaning and Inspection

    Fig 1: Inspecting Cylinder Head
    GM1372413Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Safety Glasses Caution .
  1. Clean the sealing surfaces.
  2. Inspect the cylinder head gasket and mating surfaces for leaks, corrosion, and blowby.
  3. Inspect the cylinder head for cracks.
  4. Inspect the length and width of the cylinder head using a feeler gage and a straight edge.
  5. Inspect the sealing surfaces for deformation and warpage. The cylinder head sealing surfaces must be flat, within 0.05 mm (0.002 in) maximum.
    6. Fig 2: Measuring Of Cylinder Head Height
    GM1372415Courtesy of GENERAL MOTORS CORP.
  6. Measure the height of the cylinder head from sealing surface to sealing surface. The cylinder head height should be 138.13-138.18 mm (5.438-5.440 in). If the cylinder head height is less than 138.13 mm (5.438 in), replace the cylinder head.
  7. Inspect all threaded holes for damage.
  8. Inspect all valve seats for excessive wear and burned spots.
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