Cylinder Head Installation - Left Side

Special Tools 

J 45059:  Angle Meter

For equivalent regional tools, refer to Special Tools .

Fig 1: View Of Cylinder Head Gasket Markings
Courtesy of GENERAL MOTORS CORP.
CAUTION: The left and right cylinder head gaskets are not interchangeable. Improper placement of the cylinder head gasket will block coolant and oil passages. Blocked coolant and oil passages will cause severe engine damage.
NOTE: The stamped letter, R or L, must face up. R is the right bank, L is the left bank.
1. The markings on the gasket are as follows:
   • Grade A (1)
   • Grade B (2)
   • Grade C (3)
   • Block over-bored 0.010-0.030 in (0.254-0.762 mm) (4)
   • Block over-bored 0.010-0.030 in (0.254-0.762 mm) and deck milled 0.008 in (0.203 mm) (5)
2. Install the left cylinder head gasket of the correct grade. The left and right cylinder head gaskets are not interchangeable. Refer to Cylinder Head Gasket Selection .
Fig 2: View Of Left Cylinder Head & Gasket
Courtesy of GENERAL MOTORS CORP.
3. Install the left cylinder head.
Fig 3: Cylinder Head Bolt Installation Sequence
Courtesy of GENERAL MOTORS CORP.
CAUTION: This component uses bolts with a preapplied molybdenum disulfide coating for thread lubrication. Do not remove the coating or use any additional lubricant. Improperly lubricated threads will adversely affect the bolt torque and clamp load. Improper bolt torque and clamp load can lead to engine damage.
CAUTION: Refer to Fastener Caution .
4. Install the NEW M12 cylinder head bolts.

   Tighten the M12 cylinder head bolts in four steps:

   1. 1st step 50 N.m (37 lb ft)
   2. 2nd step 80 N.m (59 lb ft)
   3. 3rd step tighten 60 degrees using J 45059:  meter
   4. 4th step tighten 60 degrees using J 45059:  meter
5. Reuse the M8 bolts. Install the M8 bolts and tighten the M8 cylinder head bolts to 25 N.m (18 lb ft).