coolant leak

[quickbrick]

just as i get my car running real good. i notice a cloud of smoke coming from the hood on the pass side next to the windshield. at first i thought my motor was on fire. well i checked it out and it is leaking coolant from the bottom of the heater core box. it only leaks when the motor is hot, and drivin for a while. i cant think of any thing else but the heater core has a hole in it. it is leaking right next to the header and valve cover. could it be anything else? how hard is it to do the heater core.thanks
cory

 

[quickbrick]

just found an interesting thread in the archives. it answered most of my questions

 

[buickboy]

Just did my heater core. It is too easy! new core was $20 lifetime. Take your time, its easy.
Mitch