Sierra 18-0603 Exhaust Manifold Gasket Set, Ford 302-351 CID Engines, Replaces GLM 39920

The Sierra 18-0603 Exhaust Manifold Gasket Set supplies the gaskets needed to properly seal the exhaust manifold on Ford 302-351 CID marine engines when installing or servicing a Sierra 18-1998-1 exhaust manifold. The set includes two exhaust manifold gaskets (18-0183-1) plus exhaust elbow gaskets, giving you a complete matched pair for a two-side installation rather than having to source individual gaskets separately. Each gasket is built to seal reliably against the heat and vibration of marine exhaust manifold service, helping prevent exhaust leaks and coolant seepage at the manifold joint on a closed cooling system setup. Sierra states that this gasket set is manufactured to meet or exceed the specifications of the original equipment part it replaces, making it a straightforward equivalent when the OEM gasket is worn, hardened, or no longer sealing correctly. The set is packaged as a single kit under Sierra part number 18-0603, so installers get all the gaskets required for the job in one purchase instead of ordering each gasket individually. It is intended for use specifically with the Sierra 18-1998-1 exhaust manifold on Ford 302-351 CID engines, and is a direct cross-reference for the GLM 39920 gasket set.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0603
• Product Name: Exhaust Manifold Gasket Set
• Fits: Ford 302-351 CID Engines
• Use With Manifold: 18-1998-1
• Includes: Exhaust manifold gaskets (18-0183-1) and exhaust elbow gaskets
• Color: White
• Weight: 0.33 pounds
• Unit Count: 1 set

Fitment

• Ford 302-351 CID Engines
• Use with Sierra 18-1998-1 exhaust manifold

Replaces (OEM)

• GLM 39920

Frequently Asked Questions

What engines does the Sierra 18-0603 gasket set fit? The Sierra 18-0603 Exhaust Manifold Gasket Set is designed for Ford 302-351 CID marine engines and is intended for use with the Sierra 18-1998-1 exhaust manifold.

Is the 18-0603 the same as GLM 39920? Yes, Sierra 18-0603 is interchangeable with GLM 39920, so it can be used as a direct replacement wherever that gasket set is called for.

What is included in the Sierra 18-0603 gasket set? The set contains exhaust manifold gaskets (18-0183-1) along with exhaust elbow gaskets, giving you the matched gaskets needed for a full manifold installation.

How many gaskets come in the 18-0603 set? The Sierra 18-0603 kit is packaged as a single unit count set containing exhaust manifold gaskets and exhaust elbow gaskets for one complete installation.

What color is the Sierra 18-0603 gasket set? The gaskets in the Sierra 18-0603 set are white.

How much does the Sierra 18-0603 gasket set weigh? The Sierra 18-0603 Exhaust Manifold Gasket Set weighs 0.33 pounds.

Does the 18-0603 gasket set work with any exhaust manifold? No, the 18-0603 set is specifically intended for use with the Sierra 18-1998-1 exhaust manifold on Ford 302-351 CID engines.

Is the Sierra 18-0603 gasket set genuine OEM or aftermarket? The 18-0603 is a Sierra-manufactured replacement gasket set built to meet or exceed the specifications of the original equipment part it replaces, rather than a factory OEM part.

Can the 18-0603 gasket set be used on a closed cooling system? The Sierra 18-0603 Exhaust Manifold Gasket Set is suited for exhaust manifold installations on Ford 302-351 CID engines using the 18-1998-1 manifold.

What part number should I order to replace worn exhaust manifold gaskets on a Ford 302-351 CID marine engine? Sierra part number 18-0603 is the correct gasket set for replacing the exhaust manifold gaskets on a Ford 302-351 CID engine equipped with the 18-1998-1 manifold.