optimum running temp?

[bobtodd]

Good thing I read this post. I had no overflow tank on my car. I just bought it two months ago and for someone reason the guy I bought it from didnt have one on it. Anyhow, I could cruise my car around town and park it somewhere and the antifreeze would come flowing out. The stock gauge was showing the needle at two lines up from the bottom...not sure what that is. Well, I turned the ignition on after the car was off to see how high the temp gauge would show as its overflowing. The needle never went any higher and it was acting wierd....so I bought an aftermarket gauge(not installed yet). I was going to buy a 180 thermostat, but since coming here and reading this, I'll stick with the stock thermo...just replace it. And I'll change my antifreeze too. I've got an electric fan and its got a shroud. I've also got long tube step headers which when I turn the car off and open the hood you can just feel the heat pouring off of them. I'm sure that doesnt help any. Anyhow, thanks for all the info. guys.