I recently took on a project boat that is in pieces and have been trying to put Humpty Dumpty back together again. The boat has a Mercruiser 888 era 1975 and the manifolds have been sitting on the floor of the boat for a few seasons. In doing research on how to put Humpty back together, I found a diagram showing standard water cooling lines. It shows a plate in between the exhaust elbow and exhaust manifold, they call this plate the "separation plate". Do I need two? One for each side? And where can I locate one, as I sure do not see the old one in the boat.
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