Sierra 18-4392 Intake Manifold Gasket Set, Replaces 27-75611A2 27-75611A1, for GM 305 & 350 CID V-8 Marine Engines

The Sierra 18-4392 Intake Manifold Gasket Set is a complete gasket kit engineered to seal the intake manifold on GM 305 and 350 cubic-inch V-8 marine engines. It is built to meet or exceed the specification of the original equipment part it replaces, giving a reliable, leak-free seal between the intake manifold and cylinder heads. The set is finished in white and supplied as a single complete kit, so every gasket needed for the job is included in one package rather than sourced piecemeal.

This gasket set is designed for MCM/MIE GM V-8 (305 and 350 cid) marine engines, including 1986 and older applications, and covers the 898 (198 HP), 200, 228, 230/260 (Inboard), 230, 250, 255, 260, 280, and 5.7L Ski engine configurations. It is a direct-fit replacement for the factory Mercury Marine gasket set, making it a straightforward choice when servicing an intake manifold on a compatible GM small-block marine engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4392
• Product Name: Intake Manifold Gasket Set
• Color: White
• Weight: 2.05 pounds
• Unit Count: 1 set
• UPC: 808282259235
• Engine Fitment: GM 305 & 350 CID V-8 marine engines

Fitment

• GM 305 & 350 CID engines, MCM/MIE V-8 applications (1986 & older)
• Engine models: 898 (198 HP), 200, 228, 230/260 (Inboard), 230, 250, 255, 260, 280, 5.7L Ski

Replaces (OEM)

• 27-75611A2
• 27-75611A1

Frequently Asked Questions

What does the Sierra 18-4392 intake manifold gasket set fit? The Sierra 18-4392 is designed for GM 305 and 350 CID V-8 marine engines, covering MCM/MIE applications (1986 and older) including the 898 (198 HP), 200, 228, 230/260 (Inboard), 230, 250, 255, 260, 280, and 5.7L Ski engine configurations.

Which OEM part numbers does the 18-4392 gasket set replace? It replaces Mercury Marine part numbers 27-75611A2 and 27-75611A1.

Is the Sierra 18-4392 a direct OEM equivalent? Yes, the 18-4392 is built to meet or exceed the specification of the original 27-75611A2 / 27-75611A1 intake manifold gasket set it replaces, so it installs as a direct equivalent.

How much does the 18-4392 intake manifold gasket set weigh? This Sierra intake manifold gasket set weighs 2.05 pounds.

What color is the Sierra 18-4392 gasket set? The gaskets in the 18-4392 set are white.

How many gaskets are included in the 18-4392 set? The 18-4392 is supplied as one complete intake manifold gasket set, packaged as a single unit for the job.

Will the 18-4392 fit a GM 350 cid MerCruiser engine? Yes, the Sierra 18-4392 is made for GM 305 and 350 CID V-8 engines, which includes 350 cid MCM/MIE marine applications.

Does the 18-4392 work on newer GM V-8 marine engines? The 18-4392 is specified for MCM/MIE GM V-8 (305 & 350 cid) engines from 1986 and older; check your engine's model and serial number against that range before ordering.

What is the UPC for the Sierra 18-4392 gasket set? The UPC for the Sierra 18-4392 Intake Manifold Gasket Set is 808282259235.

Can the 18-4392 be used to replace a leaking intake manifold gasket? Yes, replacing a worn or leaking factory 27-75611A2 / 27-75611A1 gasket set with the Sierra 18-4392 is a common repair for GM 305/350 CID marine engines showing intake manifold leaks.