Sierra 18-4348 Exhaust Manifold Gasket Set, Replaces 27-46820, for GM 454, 525 (7.4L & 8.2L)

The Sierra 18-4348 Exhaust Manifold Gasket Set is a complete gasket kit for GM 454, 525 (7.4L & 8.2L) marine engines, supplying every gasket needed to reseal the exhaust manifold assembly in one purchase. The set contains two 18-0418 Manifold to Cylinder Head Gaskets and two 18-0897 Exhaust Elbow Mounting Gaskets, covering both the manifold-to-head joint and the exhaust elbow mounting joint on the engine. Each gasket is finished in white and is built to Sierra's standard for marine exhaust sealing applications, where consistent, leak-free contact between mating surfaces is critical to prevent exhaust and water intrusion. Because the kit bundles both gasket types required for a manifold gasket job, installers do not need to source the manifold-to-head gasket and the elbow gasket separately. The 18-4348 set is intended as a like-for-like replacement for the OEM gaskets on GM 454, 525 (7.4L & 8.2L) engines and is backed by Sierra's standard customer satisfaction warranty. This kit is a straightforward fit for anyone servicing the exhaust manifold and exhaust elbow on a compatible GM 454/525 marine engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4348
• Product Name: Exhaust Manifold Gasket Set
• Fitment: GM 454, 525 (7.4L & 8.2L)
• Contains: (2) 18-0418 Manifold to Cylinder Head Gasket; (2) 18-0897 Exhaust Elbow Mounting Gasket
• Color: White
• Weight: 0.25 pounds
• UPC: 030999755964

Fitment

• GM 454, 525 (7.4L & 8.2L)

Replaces (OEM)

• 27-46820 (Manifold to Cylinder Head Gasket)
• 27-41813-1 (Exhaust Elbow Mounting Gasket)
• GLM 39890

Frequently Asked Questions

What engines does the Sierra 18-4348 gasket set fit? The Sierra 18-4348 Exhaust Manifold Gasket Set fits GM 454, 525 (7.4L & 8.2L) marine engines.

What is included in the 18-4348 gasket set? The kit contains two 18-0418 Manifold to Cylinder Head Gaskets and two 18-0897 Exhaust Elbow Mounting Gaskets, four gaskets total.

What OEM part numbers does the 18-4348 set replace? The gaskets in the Sierra 18-4348 set correspond to OEM numbers 27-46820 (manifold to cylinder head gasket) and 27-41813-1 (exhaust elbow mounting gasket), and the set is also interchangeable with GLM 39890.

How much does the 18-4348 gasket set weigh? The Sierra 18-4348 Exhaust Manifold Gasket Set weighs 0.25 pounds.

What color are the gaskets in this set? The gaskets in the Sierra 18-4348 set are white.

Is the 18-4348 set a genuine Sierra part? Yes, part number 18-4348 is a Sierra-branded Exhaust Manifold Gasket Set, and Sierra parts are covered under Sierra's customer satisfaction warranty.

Do I need to buy the manifold gasket and elbow gasket separately? No, the Sierra 18-4348 set already includes both gasket types needed for the job: two manifold-to-cylinder-head gaskets and two exhaust elbow mounting gaskets.

Will the 18-4348 gasket set work on a 502 or 8.2L GM engine? The Sierra 18-4348 Exhaust Manifold Gasket Set is designated for GM 454, 525 (7.4L & 8.2L) engines, so it covers the 8.2L displacement listed in that fitment.

Does the 18-4348 set include a warranty? Yes, the Sierra 18-4348 Exhaust Manifold Gasket Set is covered under Sierra's industry customer satisfaction warranty.

How many gaskets come in the Sierra 18-4348 kit? The Sierra 18-4348 kit contains four gaskets total: two 18-0418 Manifold to Cylinder Head Gaskets and two 18-0897 Exhaust Elbow Mounting Gaskets.