What mods will have to be done to put a 280 radiator from a 76 in a 71 240z. Also where can i buy a bolt on fan instead of the old style with the fan clutch. And what did the fan clutch do, any purpose.
Don't know about the mods for the radiator, but I can answer you about the fan clutch. It acts as a temperature sensor and turns the fan on and off as you need it. At high speeds with plenty of airflow, you don't need the fan and if its running its sapping some of the engine's horse power. In stop and go traffic that round metal coil you see on the clutch heats up and turns the fan on.