C 1500 Truck 2WD V6-4.3L VIN W (1996)
6. Disconnect the coolant bypass hose.
7. Disconnect the fuel supply and the return lines at the rear of the lower intake manifold.
8. Disconnect the wiring harness and the brackets.
9. Disconnect the throttle cable, the cruise control cable (if equipped) and the bracket from the manifold.
10. Remove the transmission oil level indicator tube.
11. Remove the EGR tube, the clamp, and the bolt.
12. Remove the PCV valve and the vacuum hoses.
13. Remove the air conditioning compressor, the bracket, and the accessory drive bracket.
14. Remove the generator bracket bolt next to the thermostat housing (if needed).
15. Remove the lower intake manifold bolts.
16. Remove the lower intake manifold.
17. Clean the old pieces of gasket from the gasket surfaces.
18. Clean the excessive carbon buildup in the exhaust passages.
19. Clean the scale and the deposits from the coolant passages.
20. Clean the EGR passage of excessive carbon deposits.
21. Inspect the manifold for cracks, broken flanges, and gasket surface damage.
Installation
1. Install the gaskets to the cylinder head with the port blocking plates facing the rear of the engine and the "this side up" stamping facing up.
2. Install RTV to the front and the rear sealing surfaces on the block.
a. Apply a 5 mm (0.197 inch) bead of RTV GM P/N 1052366 or equivalent to the front and the rear of the block.
b. Extend the bead 13 mm (0.5 inch) up each cylinder head in order to seal and retain the gaskets.
