Pre MerCruiser Intake Manifold Installation This is the process of preforming MerCruiser Intake Manifold installation. Firstly, there are two Manifolds because there is an upper and lower intake. Before installing the lower intake, we have to finish setting the valve lash. Below is a chart I found of what valves have to be adjusted depending on whether cylinder one is a Top Dead Center (Black Circles) or Cylinder Six (Ed…