Sierra 18-1976-2 Exhaust Manifold Elbow for MerCruiser V6 V8

The Sierra 18-1976-2 is a direct replacement exhaust manifold elbow designed for MerCruiser MCM/MIE GM V-6 and V-8 marine engines with center rise outlet exhaust manifolds from 1983 to 2002. This critical component features a water induction system that prevents water from entering the engine, making it essential for proper marine engine operation.

Key Features:

• 4-inch hose connection with 7-degree down angle for optimal exhaust flow
• Fits both port and starboard installations
• Compatible with Sierra manifolds 18-1952-1, 18-1953-1, and 18-1957-1
• Includes all necessary pipe plugs for complete installation
• Designed for MerCruiser V-6, V-8, and Big Block applications where 4-inch outlet riser is required
• Recommended for saltwater applications with corrosion-resistant construction

Replaces OEM Part Numbers: Mercury Marine 44354A3, 44354A9, 44354A10, 44354A13, 807914A1, 807988A2, 807988A03 | Barr MC-20-44354 | GLM 51140 | Osco 4354 | Aqua Power 5706 | Mallory 9-40559

Exhaust manifold elbows are targets for corrosion in the harsh marine environment and should be inspected regularly and replaced as needed to maintain engine performance and prevent water intrusion.