The Stovebolt Site Forums The Shop Area Engine Shop 1949 GMC Exhaust Manifold

If you are going to repair that exhaust manifold, loose mount it and the intake manifold to the head (don't forget the alignment rings in the intake ports) with an 838290 gasket (Victor # 17473, old Chevy six engines use the same part) between the two manifolds. Once you get all the bolts snug (but not tight) tighten up the intake to exhaust bolts and then remove the manifolds as one piece. Take the assembly to the machine shop and have them make the surface of both manifolds flat and in the same plane at the same time.

Ask me how I know.