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Cylinder Head (Left Side): Installation

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NOTE: Ensure threaded holes in engine block are clean and not damaged. Do not use sealer on any engines that use a composition type gasket. Align cylinder head gasket locating marks to face up. Ensure that head gasket tabs are located over cylinders No. 1 and 2 for correct installation.
  1. Place a NEW cylinder head gasket into position.
  2. Install cylinder head.
    3. NOTE: Do not reuse the cylinder head bolts. NEW cylinder head bolts must be used. The cylinder head bolts are torque-to-yield bolts and cannot be reused once the initial torque is applied. During the initial torque of the cylinder head bolt, the cylinder head bolt is stretched to achieve proper clamp load. Proper clamp load will not be achieved if a used cylinder head bolt is torqued again. A stretched cylinder head bolt can also break when torqued. Failure to replace the used cylinder head bolts with NEW cylinder head bolts can lead to improper clamp loads and extensive engine damage.
    NOTE: The sealer must be applied to a minimum of 8 threads starting at the point of cylinder head bolt.
  3. If not pre-applied to the NEW cylinder head bolts, apply Sealant (12346004) to cylinder head bolts.
  4. Install cylinder head bolts No. 1, 2 and 3. See Fig 1.
    5. NOTE: The cylinder head bolt tightening sequence must be followed. The final angle tightening sequence of the cylinder head bolts varies depending on the length of the cylinder head bolt. Failure to angle tighten the specific length bolt the proper number of degrees can lead to cylinder head bolt failure or improper clamping load of the cylinder head gasket. Cylinder head bolt or cylinder head gasket failure can lead to extensive engine damage.
    NOTE: The long bolts are used in locations 1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16, and 17. The medium length bolts are used in locations 15 and 18. The short bolts are used in locations 4, 5, 12, and 13. See Fig 2.
  5. Tighten cylinder head bolts. Tighten cylinder head bolts a first pass, in sequence to specification. See Fig 2 and TORQUE SPECIFICATIONS . Tighten cylinder head bolts a second pass, in sequence to specification, then an additional 120 degrees using a Torque Angle Meter ((J-36660-A). Tighten bolts (1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16 & 17) an additional 60 degrees, bolts (15 & 18) an additional 45 degrees, and bolts (4, 5, 12 & 13) an additional 30 degrees a final pass in sequence using the torque angle meter.
  6. Install exhaust manifold. See EXHAUST MANIFOLD (LEFT & RIGHT SIDE) .
  7. Install water crossover.
  8. Position engine harness grounds and ground strap to cylinder head.
  9. Install engine harness ground bolts. Tighten engine harness ground bolts to specification. See TORQUE SPECIFICATIONS .
  10. Install valve rocker arms and push rods. See VALVE ROCKER ARM & PUSH ROD .
  11. Install intake manifold. See INTAKE MANIFOLD .
  12. Fill and bleed cooling system. See COOLING SYSTEM BLEEDING .
Fig 1: Locating Cylinder Head Bolts No. 1, 2 & 3 (Left Side)
G00277893Courtesy of GENERAL MOTORS CORP.
Fig 2: Cylinder Head Bolt Tightening Sequence
G00277894Courtesy of GENERAL MOTORS CORP.
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