I just had the heads (69' date code) machined and "freshened up" in November on my 440. I got the heads back and threw them on the car and everything seemed fine before I stored the car for winter (live in Wisconsin). I just fired the car up this past weekend and noticed that the front freeze plug on the drivers side head and the rear freeze plug on the passanger side have a small coolant leak (more so on the front drivers side). Does anyone know if this is a leak that might improve with more hours on the new heads or if once they leak they will always leak? Also, is there an easy fix to this problem without replacing the plugs (clearance issues on the passanger side)? I called the machine shop and they said that they would fix the plugs if I brought them in but I hate to loose another weekend ripping the heads off and putting them back on.