Abstract: A marine outboard motor has an internal combustion engine including an engine block, at least one cylinder, an air intake configured to deliver a flow of air to the at least one cylinder and an exhaust conduit configured to direct a flow of exhaust gas from the at least one cylinder. The internal combustion engine also includes an exhaust gas recirculation system configured to recirculate a portion of the flow of exhaust gas from the exhaust conduit to the air intake. The exhaust gas recirculation system comprises a heat exchanger for cooling recirculated exhaust gas. The heat exchanger is removably integrated into the engine block.