Cylinder Head Installation

Special Tools 

EN-470-B  Angular Torque Wrench.

For equivalent regional tools, refer to Special Tools .

1. Clean the sealing surfaces and remove dirt and old gasket material from thread bores, water galleries and oil galleries.
   WARNING: Wear safety glasses when using compressed air in order to prevent eye injury.
2. Install a NEW cylinder head gasket (3). The marking "Top" should point to the cylinder head.
   Fig 1: Cylinder Head, Gasket, Bolts And Guide Sleeves

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: Mind the guide sleeves (4) and (5).
3. Install the cylinder head (2).
4. Install 12 NEW cylinder head bolts (1) and hand tighten.
5. Lay a straight edge (1) against the engine block and cylinder head. Adjust the transition in area (2) until there is no clearance between cylinder head and straight edge, using a rubber mallet.
   Fig 2: Straight Edge Tool

   Courtesy of GENERAL MOTORS COMPANY
6. Tighten the cylinder head bolts in the sequence shown and to the following specifications:
   Fig 3: Cylinder Head Bolts Tightening Sequence

   Courtesy of GENERAL MOTORS COMPANY
   CAUTION: Refer to Fastener Caution
   CAUTION: Refer to Torque-to-Yield Fastener Caution .
   1. Tighten the cylinder head bolts to 35 N.m (26 lb ft).
   2. Tighten the cylinder head bolts an additional 180 degrees. Use EN-470-B  wrench.