No it doesn't leak I was just curious if the 318 heater core was the same on both engines and if not would the 318 work with the 440,also I would like to thank everybody that has helped me with my countless questions all of your help is very appreciated,my mechanics are ford and chevy guys(booo!) so all of your input is very helpful as I am the only mopar guy in my group and am not a good enough mechanic yet to trust myself entirely.