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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 4.3L V6 - VIN [Z] >> Removal & Installation >> Cylinder Head >> Installation

Cylinder Head: Installation

  1. Clean gasket surfaces, bolt threads and bolt holes. If using steel head gasket, thinly coat both sides of gasket with sealant. DO NOT apply sealant to composition (steel/asbestos) head gaskets. Position head gasket on cylinder block. Ensure all holes align. Coat head bolt threads with Sealant (1052080).
  2. Install cylinder head with bolts finger-tight. Tighten head bolts in sequence to specification. See Fig 1. See TORQUE SPECIFICATIONS table at end of article. Lubricate valve tip, rocker arm pivot and push rod socket with Molykote.
  3. To complete installation, reverse removal procedure. Adjust valves. See VALVE CLEARANCE ADJUSTMENT under ADJUSTMENTS.
Fig 1: Cylinder Head Bolt Tightening Sequence
G92446Courtesy of GENERAL MOTORS CORP.
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