Sierra 18-1951-1 Starboard Exhaust Manifold for MerCruiser GM V8 Small Block

The Sierra 18-1951-1 is a direct-replacement starboard (right) side exhaust manifold designed for MerCruiser GM V8 small block engines equipped with an end riser. This log-style, water-cooled manifold is engineered to meet OEM specifications, making it a reliable and straightforward replacement for the original MerCruiser part #77235A8.

Sierra marine exhaust manifolds are manufactured as direct OEM replacements and are fully interchangeable with the original parts they are designed to replace. Each manifold is produced with precision CNC machining to ensure proper gasket mating surfaces and uniform wall and water jacket thickness, and is 100% leak tested before leaving the factory.

Key Features:

• Starboard (right) side exhaust manifold for MerCruiser GM V8 small block engines
• Log style, water-cooled design with end riser configuration
• Replaces MerCruiser OEM part number 77235A8
• Precision CNC machined gasket mating surfaces
• 100% leak tested for quality assurance
• Innovative core placement process prevents internal shifting
• Primed and painted for corrosion protection and added durability
• Supplied with mounting package

Compatible MerCruiser Models (1977–1982):

• GM V8 305 CID (5.0L) — Models 198, 228, 898
• GM V8 350 CID (5.7L) — Models 255, 260

Compatible Use With:

• Exhaust Manifold Gasket: 18-2949
• Mounting Kit: 18-8548

Sierra's comprehensive warranty backs this manifold, giving you confidence in a long-lasting, drop-in replacement that restores proper exhaust flow and engine cooling performance to your MerCruiser-powered vessel.