Sierra 18-0720 Closed Dry Joint Riser Gasket for MerCruiser Marine Engines

The Sierra 18-0720 is a closed-style dry joint riser gasket designed specifically for MerCruiser marine engines equipped with dry joint exhaust manifolds. This precision-engineered gasket features blocked water passages to maintain proper separation between exhaust and cooling channels in closed cooling systems.

Key Features:

• Closed style design with blocked water passages for closed cooling applications
• Manufactured with steel construction for durability in harsh marine environments
• Engineered to meet or exceed OEM specifications
• Precision machined mating surfaces ensure proper sealing
• Compatible with Sierra manifold 18-1843 and riser 18-1845

Applications:

• Fits GM V-6 and V-8 marine engines with dry joint exhaust manifolds (2002 and newer models)
• Compatible with 4.3L, 5.0L, 5.7L, and 6.2L engines utilizing dry joint manifold and riser systems

OEM Cross-Reference: Replaces MerCruiser part numbers 27-864549A02 and 27-864549A1. This gasket is a critical replacement component when servicing or replacing exhaust manifolds and risers, helping prevent catastrophic engine failure by maintaining proper exhaust flow and cooling system integrity.