I replaced the impeller, and it has the original shorwood metal housing. My next step was going to check out the raw water strainer and check for additional blockages. This past weekend was the first time the boat has been in the water in three years. I had the boat hooked to a fake lake about a month ago while performing a tune up, the temperature never got above 100, but it didn't run very long due to some carb issues. This past weekend while removing the thermostat I disconnected the hose from the pump,started the boat and water(hot) came out of the pump hose instantly.