Sierra 18-0722 Restricted Dry-Joint Exhaust Gasket, Replaces Mercruiser 27-864850A02/27-864850A01, Fits 4.3L Alpha/Bravo 2002 and Newer

The Sierra 18-0722 is a Restricted Dry-Joint Gasket engineered for the dry-joint exhaust manifold and riser assembly on 4.3L Alpha/Bravo sterndrive engines built 2002 and newer without an engine catalyst. It seals the joint between the exhaust manifold and riser, and its restricted design controls exhaust and cooling water flow through that joint to the manufacturer's original specification. This gasket is one of three dry-joint gasket styles Sierra offers for this application - open, closed, and restricted - so it is important to confirm that a restricted style is the correct replacement for your engine before ordering.

The 18-0722 is intended for use with Sierra's dry-joint manifold (Sierra Part Number 18-1843) and riser (Sierra Part Number 18-1845), and it is also listed alongside Sierra's dry-joint elbow gaskets 18-0720 and 18-0721 as part of the same gasket family. It directly replaces Mercruiser part numbers 27-864850A02 and 27-864850A01, making it a straightforward like-for-like swap when servicing the exhaust manifold-to-riser joint. The gasket is round in shape and finished in white.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0722
• Gasket Style: Restricted
• Shape: Round
• Color: White
• Weight: 0.25 pounds
• UPC: 808282359461
• Used With: Sierra Manifold 18-1843 and Sierra Riser 18-1845
• Related Dry-Joint Elbow Gaskets: 18-0720 (Closed), 18-0721 (Open)
• Fits: 4.3L Alpha/Bravo (2002 and Newer without Engine Catalyst)

Fitment

Fits 4.3L Alpha/Bravo applications, 2002 and newer, without engine catalyst. Used with the dry-joint manifold and riser on 4.3L, 5.0L, 5.7L, and 6.2L engines.

Replaces (OEM)

Replaces Mercruiser 27-864850A02 and 27-864850A01.

Frequently Asked Questions

What engines does the Sierra 18-0722 gasket fit? The Sierra 18-0722 fits 4.3L Alpha/Bravo sterndrive applications built 2002 and newer without an engine catalyst, and is used with the dry-joint manifold and riser on 4.3L, 5.0L, 5.7L, and 6.2L engines.

What OEM part numbers does the 18-0722 replace? It replaces Mercruiser part numbers 27-864850A02 and 27-864850A01.

Is the 18-0722 the open, closed, or restricted style gasket? Sierra 18-0722 is the restricted style dry-joint gasket; Sierra also offers 18-0720 as the closed style and 18-0721 as the open style for the same application.

What manifold and riser does this gasket work with? The 18-0722 restricted gasket is designed for use with Sierra's dry-joint manifold, Sierra Part Number 18-1843, and Sierra's dry-joint riser, Sierra Part Number 18-1845.

How do I know if I need the restricted, open, or closed gasket style? The three Sierra dry-joint gaskets - 18-0720 (closed), 18-0721 (open), and 18-0722 (restricted) - control exhaust and cooling water flow differently through the manifold-to-riser joint, so match the style to what your original gasket was to ensure correct flow through the joint.

What shape and color is the 18-0722 gasket? The Sierra 18-0722 is a round gasket finished in white.

How much does the Sierra 18-0722 gasket weigh? The Sierra 18-0722 restricted dry-joint gasket weighs 0.25 pounds.

Is the Sierra 18-0722 a genuine Sierra part or aftermarket equivalent? The 18-0722 is a genuine Sierra part manufactured to meet or exceed the original Mercruiser part it replaces, 27-864850A02/27-864850A01.

Does the 18-0722 fit engines with an engine catalyst? No, the fitment for the 18-0722 is specified as 4.3L Alpha/Bravo, 2002 and newer, without engine catalyst.

What is the UPC for the Sierra 18-0722 gasket? The Sierra 18-0722 restricted dry-joint gasket carries UPC 808282359461.

Can the 18-0722 be used with the 18-0720 or 18-0721 gaskets on the same joint? No, only one gasket style is used per joint; 18-0720, 18-0721, and 18-0722 are alternative styles for the same dry-joint manifold-to-riser application, not parts used together.