Ok just got a new boat and im new to out drives tag on out drive says 3868389 from what I can tell thru the forums is that its a omc outdrive labeled as a sx-c1 volvo drive, anyways I need to know if it has a water pump impeller in the lower unit or if the raw water pump does all the work. 97 chris craft 19 concept with 432bplkd omc volvo tagged 4.3 gm motor. Any help would be awsome. Thanks