Sierra 18-1976-2 MerCruiser V6/V8 GM 2002 & Older Manifold Elbow Replaces 807988A03Unlike automotive engines, all marine inboards have exhaust risers that feature a water induction elbow. Located behind the engine's coolant reservoir, the manifold elbow is a critical component to prevent water from entering the engine. It is also a target for corrosion and must be examined frequently and replaced as needed. Sierra, a leading aftermarket manufacturer offers the 18-1976-2 MerCruiser Manifold Elbow which is compatible with most MerCruiser V6 and V8 applications, 7 degree (4" O.D. Riser). This component is recommended for saltwater applications, additional product information follows:Application:MerCruiser V6 & V8 engines made by GM 2002 and older with a center rise outlet exhaust manifoldIncludes: Exhaust Manifold 18-1953-2 for V8 305, 350, 377 engines 1983-2002; Exhaust Manifold 18-1952-1 for V6 229 & 262 engines 1985-2002; Exhaust Elbow Gasket 18-0897; Pipe Plug 18-4258; Replaces: Barr; MC-20-44354; EMP; 57-57513; GLM; 51140; Mallory; 9-40559; MerCruiser; 44354A3; 807914A1; 44354A9; 44354A10; 44354A13; 807988A2; 807988Q03; 807988A03; Osco; 4354;