Sierra 18-2833-9 Exhaust Elbow Gasket, Replaces 27-99777-2, Fits MCM 120/140/470/GM V-8 Small Block/Ford V-8, Pack of 2

The Sierra 18-2833-9 Exhaust Elbow Gasket is a round replacement gasket sold in a pack of two for sealing the exhaust elbow-to-manifold joint on inboard and stern drive engines. It is a direct cross-reference to OEM gasket 27-99777-2 and is manufactured to meet or exceed the performance of the original equipment part it replaces, making it a reliable choice for routine exhaust system maintenance and elbow replacement.

This gasket is used with Sierra manifold elbows 18-1971 and 18-1978, and it is the same gasket included in the Sierra 18-4362 mounting kit. It is also the correct gasket for the 18-4008 block off plate used on manifolds 18-1958-1 and 18-1962-1, which requires two of these gaskets per installation. Because it ships as a pack of two, a single purchase covers both exhaust elbow gaskets needed for a complete job.

The 18-2833-9 gasket fits a broad range of marine engines, including Mercruiser MCM 120 (1993 and newer), 140/3.0L, 470, and 165 in-line 6 cylinder engines, GM V-8 small block engines (1982 and older), and Ford V-8 engines. It weighs 0.08 pounds per pack and is backed by a 90-day Sierra warranty.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2833-9
• Product Type: Exhaust Elbow Gasket
• Pack Quantity: 2
• Weight: 0.08 pounds
• Shape: Round
• UPC: 808282163402
• OEM Cross Reference: 27-99777-2
• Compatible Elbows: 18-1971, 18-1978
• Compatible Mounting Kit: 18-4362
• Warranty: 90 days

Fitment

• Mercruiser MCM 120 (1993 and newer)
• Mercruiser 140/3.0L
• Mercruiser 470
• Mercruiser 165 in-line 6 cylinder
• GM V-8 small block (1982 and older)
• Ford V-8 engines

Replaces (OEM)

• 27-99777-2

Frequently Asked Questions

What engines does the Sierra 18-2833-9 exhaust elbow gasket fit? The Sierra 18-2833-9 exhaust elbow gasket fits Mercruiser MCM 120 (1993 and newer), 140/3.0L, 470, and 165 in-line 6 cylinder engines, GM V-8 small block engines (1982 and older), and Ford V-8 engines.

How many gaskets come in the package? This listing is sold as a pack of two 18-2833-9 elbow gaskets, enough to service both exhaust elbows in a typical installation.

What OEM part number does 18-2833-9 replace? 18-2833-9 is the direct cross-reference equivalent to OEM part 27-99777-2.

Which exhaust elbows use this gasket? The 18-2833-9 gasket is used with Sierra manifold elbows 18-1971 and 18-1978, and it is also the gasket included in the 18-4362 mounting kit.

Is this a genuine Sierra part or aftermarket? It is a genuine Sierra International part, manufactured to meet or exceed the performance of the original equipment gasket it replaces.

How much does the 18-2833-9 gasket weigh? The 18-2833-9 gasket pack weighs 0.08 pounds.

What shape is the gasket? The Sierra 18-2833-9 exhaust elbow gasket is round in shape.

Does the block off plate use this gasket too? Yes, the 18-4008 block off plate used with manifolds 18-1958-1 and 18-1962-1 requires two 18-2833 elbow gaskets, matching this part.

What is the warranty on this gasket? Sierra backs the 18-2833-9 exhaust elbow gasket with a 90-day warranty.

Is the 18-2833-9 gasket compatible with GM V-8 small block engines? Yes, the 18-2833-9 gasket fits GM V-8 small block engines built in 1982 and older.