Exhaust Manifold Gasket Function
An exhaust manifold gasket serves a pretty straightforward purpose; to seal exhaust gas at the joint where the manifold attaches to the cylinder head exhaust ports. Although that's a straightforward task, it is not an easy one to perform. In high performance applications, the exhaust manifolds are called "headers" and are made of welded steel tubing. Most OE car and truck manifolds are made of cast iron and are the subject of this discussion. High performance headers will be covered in a separate high performance section of Magnum GasketMaster.

An exhaust manifold gasket must:

Most exhaust manifold gaskets are made of one of the following constructions:

Magnum has carefully evaluated each application to select the most cost-effective, durable choice.

Intake/Exhaust Manifold Gasket Function
Some inline 4 and 6 cylinder engines are designed with intake and exhaust ports on the same side of the cylinder head. This makes it possible, in some instances, to offer a single manifold gasket that combines features of both intake and exhaust gaskets. Magnum covers the most popular applications, using materials that meet the same high standards applied to our separate intake and exhaust manifold gaskets.
These gaskets are found mostly on older models, in which coolant does not pass through the intake manifold.

Exhaust and Intake/Exhaust Manifold Gasket Disassembly

The greatest challenge here is removing, rusty, frozen nuts and bolts. There are many different methods and preferences for accomplishing this. Use whichever method you prefer but please take special care not to distort, crack or gouge flanges and gasket surfaces in the process. You'll also need to evaluate fasteners to determine if they will need to be replaced.
These gaskets are found mostly on older models, in which coolant does not pass through the intake manifold.

There is one more very important step if you are disassembling an inline engine in which the intake and exhaust manifolds attach to each other. That is to separate them and replace any gasket the in the joint between then but ONLY HAND TIGHTEN THE CONNECTING FASTENERS UNTIL THE MANIFOLDS ARE RE-INSTALLED ON THE CYLINDER HEAD. It is tempting to leave them attached to each other but they need the opportunity to independently compress their manifold gaskets against the cylinder head. Only then, can they be tightened together.

Exhaust and Intake/Exhaust Manifold Gasket Assembly

Most exhaust manifold gasket installations are fairly simple except for dealing with heavy castings and awkward fastener installations. Be sure that fasteners are wire brushed or replaced before use. Lubricate them when installed; an anti-seize compound is ideal to make removal easier the next time.

As noted in the prior section, intake and exhaust manifolds, which are attached to each other, and use a combination manifold gasket, need to be separated and tightened on the cylinder head before tightening to each other. Double check for any intake or exhaust leaks at startup.