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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Cylinder Head Cleaning and Inspection >> Flatness Measurement Procedure

Flatness Measurement Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the cylinder head for warpage with a straight edge and feeler gage.
    • A cylinder head block deck with warpage in excess of 0.050 mm (0.002 in) within a 150.0 mm (6.0 in) area must be repaired or replaced.
    • A cylinder head exhaust manifold deck with an overall warpage in excess of 0.102 mm (0.004 in) must be repaired or replaced.
    • A cylinder head intake manifold deck with warpage in excess of 0.080 mm (0.003 in) must be repaired or replaced.
    2. Fig 1: Inspecting Cylinder Head For Warpage
    GM64318Courtesy of GENERAL MOTORS CORP.
  2. A cylinder head block deck can be resurfaced up to 0.305 mm (0.012 in) maximum removal.
    3. IMPORTANT: Excessive cylinder head resurfacing will affect compression ratio and emission control.
  3. A cylinder head that requires excessive resurfacing must be replaced.
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