UANOFCN 807166A1 Water Shutter Exhaust Flapper Pair for MerCruiser Stern Drive V6/V8 175-370 Engines

Overview

Upgrade your MerCruiser exhaust system with the UANOFCN 807166A1 water shutter pair. This kit includes two sturdy exhaust shutter flappers and four grommets, crafted to fit a range of stern-drive configurations and to stand up to marine conditions. The design emphasizes a secure seal, smooth operation, and durable materials that hold up under regular boating use.

Fitment at a glance

• Two exhaust shutter flappers with four accompanying grommets for secure mounting and a reliable seal.
• 3-inch water shutter compatible with MerCruiser 807166A1 and GLM 89175 for straightforward pairing when needed.
• Broad engine compatibility: MerCruiser V6 and V8 with 4" Y-Pipe setups from 1992–2001, plus DRY JOINT configurations (7° in 2002–2004 and 14° in 2005–2010) and various WET JOINT configurations (GM 229/262 CID; GM 305/350/377 CID; GM 454/502 CID).
• Important compatibility notes: not suitable for V6 engines with one-piece manifolds; not for early V8 models using a round-pin flapper.

Materials and durability

• Constructed from premium metal and rubber to balance hardness, flexibility, and long-term resilience.
• OEM-quality construction designed to match original-part performance and fit in compatible systems.

What to expect on the water

When installed in a compatible setup, these shutters support the intended exhaust routing and can contribute to steadier operation across throttle ranges. The included grommets help reduce vibration and wear, while the durable materials aim to resist corrosion from marine environments. Think of this kit as a practical upgrade for boats that rely on MerCruiser stern-drive configurations in V6 or V8 applications.

Installation notes and tips

• Verify that your engine and exhaust manifold configuration align with the listed DRY and WET joint specs before installation.
• Double-check compatibility regarding manifolds and pin styles to ensure a correct match.

Choosing UANOFCN means selecting a component designed to align with OEM standards and to function as a thoughtful replacement in supported MerCruiser setups. Consider this pair if you’re seeking a practical, robust update that mirrors original-part intent without making guarantees about performance enhancements.