From my experience I don't think it will do any harm to not use a thermostat. I have a 57 buick and have problems with it overheating. It would take forever for the motor to get hot enough to open the thermostat. The thermostat would finally open, and the heat gauge would immediately drop back into the normal range, but then it would soon close and the cycle would start over again. Too hot, cool, back to too hot and so on. I now realize I was using the wrong thermostat, but my solution was to just do away with the thing. In the summer the motor would go to normal operating temperature and stay there, and in the winter, if I wanted to drive it, I just put a small piece of cardboard in front of the radiator to block the air flow to a small portion of it, and everything worked fine. I have done this for a long time with no problems. I realize this is a Buick not a Chevy, but the principle should be the same. Allen
