You should place a new exhaust manifold gasket onto the cylinder head, next position the exhaust manifold to the cylinder head, and apply thread lock GM P/N 12345493 (Canadian P/N 10953488) to the exhaust manifold bolt threads, then install the exhaust manifold bolts, and tighten the exhaust manifold bolts in sequence, install the exhaust manifold heat shield, and the exhaust seal.
By BobGM Specialist
01/11/2022