A shroud can make a big difference especially if the fan is very far from the radiator, you did not say what you were running for a thermostat????? In a message dated 6/23/2010 5:27:51 P.M. Central Standard Time, cory_383@xxxxxxxxxxx writes: Greetings from Canada. Just put a 440 into my 65 Polara which was originally a 318 poly. The 318 never over heated, but this 440 constantly runs very hot. To the point where it starts to ping. It's got a big block rad in it and the water pump is good. The only thing I can think of is that I don't have a shroud. Can a shroud make that big of a difference? I've never had this problem before. Suggestions would be appreciated? _________________________________________________________________ Game on: Challenge friends to great games on Messenger http://go.microsoft.com/?linkid=9734387 -- [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public 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. -- [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public 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.