Sierra 18-1966-1 Exhaust Manifold for MerCruiser 3.0L/LX 1990+

The Sierra 18-1966-1 is a premium aftermarket exhaust manifold designed specifically for MerCruiser 3.0L and 3.0LX stern drive engines manufactured from 1990 to present. This precision-engineered marine exhaust manifold serves as a direct OEM replacement, offering reliable performance in the harsh marine environment.

Key Features:

• Constructed from durable cast iron for long-lasting performance
• Factory powder coated finish for corrosion resistance and protection
• Precisely machined and leak tested before packaging
• Ready to install straight out of the box
• Includes exhaust manifold gaskets for complete installation
• Meets or exceeds original equipment specifications

OEM Cross References: Replaces Mercury/MerCruiser part numbers 806867A3, 806867A9, 806867A12, 815560A5, 815560A7, and 860235A03. This is the updated version that supersedes the older Sierra part number 18-1966.

Sierra Marine has over 50 years of experience manufacturing premium-quality aftermarket marine engine parts. Each manifold is engineered to handle today's high horsepower engine demands while standing up to the corrosive marine environment. Don't wait until a corroded manifold causes engine damage—replace your worn exhaust manifold with this quality Sierra component for reliable, trouble-free operation.