[My94T/A]

Hi I just got my 160 stat installed my Jon, a fellow board member. Now I have a question. I thought the reason everyone uses these thermostat's is because they operate at a lower temperature. I let the car idle and warm up, basically to see what happens and when it when past 210 mark I was surprised. So i shut the engine off and opened up the two bledder screw jon showed me and told me to close them when they start spitting coolant and I did that. Then started the engine again and same thing went up to 220 and the fans came on and temp cooled down to 210. Is it suppose to do that? or did it get a dud?? Thank you in advance for all the help.