Re: Just bought a 1941 Packard 120 - Considering a frame off resto

Posted by TxGoat On 2023/11/19 22:01:51

That crack is in the exhaust heat jacket on the intake manifold. It (probably) won't leak air into the intake proper. The crack may be due to the engine having run a long time with the heat valve stuck, and leaking exhaust manifold gaskets can also contribute to cracking. I'd look around for a better intake/exhaust manifold assembly, but the engine will probably run OK with what you have.

When you get the engine running, it might be a good idea to retorque the cylinder head, using a good torque wrench and tightening in two stages in the correct pattern to the correct torque.