Hi,
If you can get a complete new head for that price, I would replace it. Doing a valve job isn't a five minute job and there is always a chance a valve will need replaced or there is damage to the head.
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Here are directions for replacement of a cylinder head. The attached pics correlate with the directions.
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2005 Buick Allure (CANADA) V6-3.8L
Cylinder Head Replacement - Left
Vehicle Engine, Cooling and Exhaust Engine Cylinder Head Assembly Service and Repair Procedures Cylinder Head Replacement - Left
CYLINDER HEAD REPLACEMENT - LEFT
Cylinder Head Replacement - Left
Tools Required
J45059 Electronic Torque Angle Meter
Removal Procedure
1. Disconnect the negative battery cable.
2. Raise and support the vehicle. Refer to Vehicle Lifting.
3. Drain the engine oil.
4. Drain the cooling system.
5. Lower the vehicle.
6. Remove the air cleaner intake duct.
7. Remove the ignition control module and the bracket from the left cylinder head.
8. Remove the right engine mount strut bracket.
9. Remove the left engine mount strut bracket.
10. Remove the lower intake manifold.
11. Remove the left spark plugs from the left cylinder head.
12. Remove the left exhaust manifold.
13. Remove the left valve rocker arm cover.
14. Remove the left rocker arms and the push rods.
Pic 1
15. Remove the left cylinder head bolts. Discard the cylinder head bolts.
16. Remove the left cylinder head.
Pic 2
17. Remove the cylinder head gasket.
18. Remove the caps, the springs, the valves and the seals from the cylinder head.
19. Clean the gasket mating surfaces on the cylinder head, the cylinder block and the intake manifold.
20. Clean the cylinder block bolt hole threads.
21. Inspect the engine block.
22. Inspect the cylinder head.
Installation Procedure
1. Install the valves, the seals, the springs and the caps to the cylinder head.
Pic 3
2. Position the head gasket with the arrow pointing to the front of the engine.
Notice: Head gaskets are not interchangeable. The head gasket must be installed with the arrow pointing to the front of the engine. Installing the head gasket in any other direction will cause gasket failure and possible engine failure.
Pic 4
3. Install the cylinder head.
Pic 5
4. Install the new cylinder head bolts (1-8).
1. Tighten the cylinder head bolts (1-8) in the following sequence to 50 Nm (37 ft. Lbs.).
2. Use the J45059 to rotate the cylinder head bolts in the following sequence (1-8) an additional 120 degrees.
Notice: This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.
Notice: This engine uses special torque to yield head bolts. This design bolt requires a special tightening procedure. Failure to follow the given procedure will cause head gasket failure and possible engine damage.
Notice: Refer to Fastener Notice in Service Precautions.
5. Install the left push rods and rocker arms.
6. Install the left valve rocker arm cover.
7. Install the left exhaust manifold.
8. Install the left spark plugs to the left cylinder head.
9. Install the lower intake manifold.
10. Install the left engine mount strut bracket.
11. Install the right engine mount strut bracket.
12. Install the ignition control module bracket and the ignition control module to the left cylinder head.
13. Install the air cleaner intake duct.
14. Fill the cooling system.
15. Fill the crankcase with engine oil.
16. Connect the negative battery cable.
17. Inspect for leaks.
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At least on this engine, you don't have to worry about the timing when removing the head. Let me know if this helps or if you have other questions. Don't be worried about doing it. I'll do my best to help, so you are not alone doing it.
Take care,
Joe
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Thursday, April 9th, 2020 AT 4:37 PM
