For 1990-2009 cars

1. Install the cylinder block-to-cylinder head alignment dowels.
2. Install the NEW front oil gallery expansion plug.
3. Ensure the NEW front oil gallery expansion plug is installed to the proper depth.
4. Install the cylinder block-to-transmission alignment dowels.
5. Apply the RTV sealant, GM P/N 12378521 (Canadian P/N 88901148) or equivalent on the NEW coolant expansion plugs.
6. Install the NEW coolant expansion plugs.
7. Ensure the NEW coolant expansion plugs are installed to the proper depth.
8. Apply thread sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent on the threads of the M20 left side oil gallery threaded plug.

Caution: Refer to Fastener Caution in the Preface section.

9. Install the M20 left side oil gallery threaded plug and tighten to 31 N·m (23 lb ft).
10. Apply thread sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent on the threads of the M14 left side coolant drain threaded plug.
11. Install the M14 left side coolant drain threaded plug and tighten to 31 N·m (23 lb ft).
12. Apply thread sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent on the threads of the M14 rear oil gallery threaded plug.
13. Install the M14 rear oil gallery threaded plug and tighten to 31 N·m (23 lb ft).
14. Apply thread sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent on the threads of the M14 right side coolant drain threaded plug.
15. Install the M14 right side coolant drain threaded plug and tighten to 31 N·m (23 lb ft).
16. Apply thread sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent on the threads of the M14 right side oil gallery threaded plug.
17. Install the M14 right side oil gallery threaded plug and tighten to 31 N·m (23 lb ft).
18. Install the cylinder block-to-oil pan alignment dowels.
19. Install the NEW right front oil pan rail oil gallery expansion plug.
20. Ensure the NEW right front oil pan rail oil gallery expansion plug is installed to the proper depth.
21. Install the oil jets.
22. Install the oil jet bolts and tighten to 10 N·m (89 lb in).
23. Install the NEW crankshaft position sensor O-ring, if damaged.
24. Install the crankshaft position sensor.
25. Install the crankshaft position sensor bolt and tighten to 10 N·m (89 lb in).
26. Install the left knock sensor to the cylinder block, as shown.
27. Install the left knock sensor bolt and tighten to 23 N·m (17 lb ft).
28. Ensure proper sensor orientation.
29. Install the right knock sensor to the cylinder block, as shown.
30. Install the right knock sensor bolt and tighten to 23 N·m (17 lb ft).
31. Ensure proper sensor orientation.
32. Install the block heater cartridge, if equipped.