Help-Lost my anti freeze installing headers

[stevewhitmore]

While installing my new headers, I had to remove the coolant sensor in the side of the block and lost most of my antifreeze in the process.
Question is, can I start the motor without this antifreeze without doing harm to the motor? Probrably a pretty dumb question, but not my first to ask you guys who have been great help in the past and I don't want to blow a motor
By the way, I used the Summit headers on my 69 as you suggested and they went on flawlessly.
Thanks for any guidance