Sierra 18-1845 Dry-Joint Exhaust Riser, Replaces 27-864850A02 & 27-864547A1, Fits 4.3L/5.0L/5.7L/6.2L Engines

The Sierra 18-1845 is a dry-joint exhaust riser (elbow) built for marine engines that use the dry-joint manifold and riser exhaust system. It routes exhaust and cooling water away from the exhaust manifold and is designed as a direct replacement for the original equipment riser on applicable 4.3L, 5.0L, 5.7L, and 6.2L engines. The dry-joint design keeps the exhaust and cooling water paths separated at the manifold-to-riser connection until they combine further along the system, which is the defining feature of this riser style versus a wet-joint design.

This riser is intended to be used together with the matching 18-1843 or 18-1842 exhaust manifold and the 18-1845 riser as a complete dry-joint set, so the components seal and fit correctly. It is a round, white-finished component sized to bolt directly in place of the original riser it replaces. Because it is a direct-fit replacement part, no modification to the exhaust system is required during installation.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1845
• Product Type: Dry-Joint Exhaust Riser
• Color: White
• Shape: Round
• Weight: 27.2 pounds
• UPC: 808282359430
• Engine Fitment: 4.3L, 5.0L, 5.7L, 6.2L using the Dry Joint Manifold and Riser
• Used With: 18-1843 and 18-1842 exhaust manifolds
• OEM Cross Reference: 27-864850A02, 27-864547A1

Fitment

• Fits 4.3L, 5.0L, 5.7L, and 6.2L engines utilizing the Dry Joint Manifold and Riser exhaust system
• Used with 18-1843 or 18-1842 exhaust manifolds and the 18-1845 riser as a matched set

Replaces (OEM)

• 27-864850A02
• 27-864547A1

Frequently Asked Questions

What engines does the Sierra 18-1845 exhaust riser fit? The Sierra 18-1845 fits 4.3L, 5.0L, 5.7L, and 6.2L engines that use the Dry Joint Manifold and Riser exhaust system.

What OEM part numbers does the 18-1845 replace? The 18-1845 riser replaces OEM numbers 27-864850A02 and 27-864547A1.

Is the 18-1845 a wet-joint or dry-joint riser? It is a dry-joint riser, meaning the exhaust and cooling water paths stay separated at the manifold-to-riser connection, unlike a wet-joint design.

How much does the 18-1845 exhaust riser weigh? The Sierra 18-1845 weighs 27.2 pounds.

What color and shape is the 18-1845 riser? The 18-1845 has a white finish and a round shape.

What manifold should I pair with the 18-1845 riser? The 18-1845 riser is designed to be used with the 18-1843 or 18-1842 exhaust manifold as a matched dry-joint set.

Can the 18-1845 be installed as a direct replacement without modification? Yes, the Sierra 18-1845 is built as a direct-fit replacement riser for the applicable dry-joint exhaust system, requiring no modification to install.

Does the 18-1845 come as a single riser or a full manifold kit? The 18-1845 is the riser component itself; it is used together with a separate 18-1843 or 18-1842 manifold to complete the dry-joint exhaust system.

Is the Sierra 18-1845 the same part regardless of engine size? One 18-1845 part number covers 4.3L, 5.0L, 5.7L, and 6.2L engines that use the Dry Joint Manifold and Riser system, since it is not liter-specific in design.

What is the UPC for the Sierra 18-1845 riser? The UPC for the Sierra 18-1845 exhaust riser is 808282359430.