1948 288 wants to overheat

Posted by Richard A. Alwes On 2009/8/29 13:24:50

My 48 Packard with it's 288 engine tries very hard to overheat. The thermostat is out of the engine so no bad thermostat. When the engine is ran the temperature gauge needle stays just before the H on the temperature gauge. The radiator has been been serviced it is not clogged up. Suggestions please as to what my problem may be. Should I pull the water pump and freeze plugs and try and clean the block?