Looking at purchasing the GLM replacement exhaust manifolds for a Volvo Penta 431B engine. I notice on the Riser Elbow of the GLM there is no water port like on the stock one. There is still the water port on the manifold itself but not the second water port on the riser elbow. How does this work? Do you simply plug the line that goes to the riser elbow or is that a necessary port that must be redirected somewhere else or T'd in to the manifold port?
