Re: 1949 thermostat 288 engine

Posted by HH56 On 2017/4/27 10:03:04

The bellows thermostat was replaced and Packard transitioned to the modern pellet or capsule type thermostat starting in the early 50s when pressure caps increased over 7 lbs. If you are going to run a higher pressure cap suggest you stick with the pellet type because at increased pressures the bellows are squeezed together by the extra pressure and may not be able to open completely. If the thermostat you bought at Rock Auto is the correct temperature and will fit snugly at the outlet ledge I would use that one.