Can't get off a stop valve

[slownsteady]

Working under my bathroom vanity in order to replace the faucet. The stop valves are old and I would like to replace them. But they are stuck...stuck...stuck. From all I can see they are threaded on (last couple of threads visible and some teflon tape). I can't budge either of them with a wrench. I tried applying heat with a propane torch, and (separately) have tried penetrating fluid.
Any other ideas??

 

[havasu]

Take a pic for us!

 

[billshack]

turn of the water to the house and drain completely, the heat the stops to almost red hot , use two wrenches , it should come apart

 

[slownsteady]

Not much to see. Looks normal from the front. I thought I had it hot enough to melt solder - just in case the guy who did this was a "belt & suspenders" type of guy.

 

[slownsteady]

I can probably cut it off and add an adapter, but since the thread is integral, I'd rather not.

 

[slownsteady]

House water is off. I going to have to get this done soon. Can't leave the water off into the evening .

 

[slownsteady]

Okay, heated it so hot that a flame came out of the valve (never had that happen before!), but that did it. One down and one to go

 

[slownsteady]

Shiny new faucet above and shiny new valves below.

 

[bud16415]

Great job. Now open and close them once a month and they will work great for many years. Trouble is no one ever does that.

 

[slownsteady]

I use the quarter-turn style whenever I encounter an old one. But yes, exercising them is still a good idea.