is this a blown head gasket ?

nicoles said
I have a 66 barracuda with a 273 2bl carb. after it warms up i've noticed that I have pressure built up in the radiator .I'll take the cap off and the water boils out . I checked the water temp and it said 185 .also the gadge read normal.

I'm just wondering.....what ever made you think there was a problem?......unless it was blowing coolant or steam out of the overflow......(?)