GMC chervolet camaro 1999 Service Manual page 840

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Engine
37. Remove the upper intake manifold gasket (1).
38. Clean the upper and lower intake manifold sealing
surfaces.
39. Remove the lower intake manifold 0-ring;s
seals (3, 4), if necessary.
Installation Procedure
1. Install new lower intake manifold 0-ring
seal (3, 4), if removed.
Engine Mechanical - 3.8 L 6-57
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