Quicksilver 8637251 GasketExhaust elbow gasket 8637251 is designed for closed cooling systems on select MerCruiser V6 and V8 sterndrive and inboard engines made by General Motors with center rise outlet exhaust manifolds. Refer to the owner's or service manual for specific application and installation instructions.Fits - GM V-6 & V-8 with center rise outlet exhaust manifold *Special Order Item