Sierra 18-4396 Exhaust Manifold Gasket Set, Replaces 27-46401A1, for 250 (4.1L) CID Engine 165 HP S/N 2770032 & Up

The Sierra 18-4396 Exhaust Manifold Gasket Set is built to meet or exceed original equipment quality for engines that call for OEM 27-46401A1. This set is engineered for 250 (4.1L) CID engines rated at 165 HP with serial numbers 2770032 and up, giving boat owners a direct replacement when resealing the exhaust manifold during maintenance or after a failed gasket causes leaks, overheating, or exhaust smell in the engine compartment.

The kit includes the components needed to reseal the exhaust manifold joint, including an intake exhaust gasket (O.E. 27-46401) and a thermostat gasket, so the job can be completed without sourcing separate individual gaskets. Each gasket is manufactured to original equipment specifications for a proper seal and reliable fit against the mating surfaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4396
• Product Type: Exhaust Manifold Gasket Set
• Included Components: Exhaust Manifold Gasket Set (Intake Exhaust Gasket, Thermostat Gasket)
• Number of Items: 1
• Weight: 0.48 pounds
• UPC: 030999563590

Fitment

• 250 (4.1L) CID Engine, 165 HP, S/N 2770032 & Up

Replaces (OEM)

• 27-46401A1

Frequently Asked Questions

What does the Sierra 18-4396 Exhaust Manifold Gasket Set fit? It is designed for 250 (4.1L) CID engines rated at 165 HP with serial numbers 2770032 and up.

What OEM part number does Sierra 18-4396 replace? It replaces OEM part number 27-46401A1.

What is included in the 18-4396 gasket set? The set contains an intake exhaust gasket (O.E. 27-46401) and a thermostat gasket, giving you the gaskets needed to reseal the exhaust manifold joint in one package.

How many of these gasket sets come in a package? The Sierra 18-4396 ships as a single set containing one of each included gasket.

How much does the Sierra 18-4396 gasket set weigh? It weighs 0.48 pounds.

Is Sierra 18-4396 an OEM part or an aftermarket replacement? It is an aftermarket Sierra part manufactured to meet or exceed the quality of the original equipment part it replaces, OEM 27-46401A1.

When should I replace the exhaust manifold gasket set? Replace the gasket set anytime the exhaust manifold is removed for service, or if you notice exhaust leaks, unusual exhaust smell in the engine bay, or coolant/water seepage near the manifold joint, since a worn gasket will not reseal reliably once disturbed.

Does Sierra 18-4396 include the thermostat gasket? Yes, a thermostat gasket is included along with the intake exhaust gasket in this set.

What is the UPC for Sierra part 18-4396? The UPC for the Sierra 18-4396 Exhaust Manifold Gasket Set is 030999563590.

Will this gasket set work on any marine engine? No, the 18-4396 set is specific to 250 (4.1L) CID engines, 165 HP, with serial numbers 2770032 and up; confirm your engine's serial number falls in that range before ordering.