Looks like you have been getting some very good information on cooiing systems. Just a recap of radiator caps: The pressure cap increases the maximun pressure in the system AND increases the boiling point of the coolant in your system. The increase in boiling point and pressure is approximately 3 degrees per 1 pound increase in pressure cap rating. Therefore a 13 pound cap will increase the boiling temperature of your radiator to approximately 242 degrees. (my choice for a cap) Therefore a 18 pound cap will increase the boiling temperature of your radiator to approximately 266 degrees. (very hot) Dennis C. On Jul 14, 5:19 am, Jay <krods...@xxxxxxxxx> wrote: > Hello to all,,Question! > > My 440's seem to be running a bit hot,,it's a 1971 and i was running a 180 > degree thermostat,and so just yesterday i changed it over to a 160 degree. What > is the best or proper thermostat to use on that 440. > > The radiator cap was a Stants 13 psi and i changed it over to a Mopar 18 psi > that i hand as an extra. > It keeps blowing out antifreeze into the reserve tank every time i park it > What is the best or proper radiator cap to use on a 440 of that year. > > Thanks, > Jay > 1965 727, B/B Coronet 500. -- -- Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. -- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. http://groups.google.com/group/1962to1965mopars?hl=en.