Impala V6-3.9L (2007)
1. Install a NEW exhaust manifold gasket onto the cylinder head studs.
2. Install the exhaust manifold.
Notice: Refer to Fastener Notice.
3. Install the exhaust manifold bolts.
Tighten the bolts to 20 N.m (15 lb ft).
4. Install the exhaust crossover pipe to left exhaust manifold nuts.
Tighten the nuts to 20 N.m (15 lb ft).