Who here runs an O-Ringed block? Leaking head gasket problem!

Update on this. I used a product called Steel Seal over the weekend. It's guaranteed to seal your head gasket or your money back. Although very expensive ($110), it was a cheaper option than pulling the engine back out again so I gave it a shot. It says to run the engine at 1000 rpms for one hour! I wasn't about to let it sit there and idle for an hour so I let it idle for about 15 or 20 minutes and drove the car for another 45 minutes around town. I believe that they instruct this way if you actually have a blown head gasket and they don't want you to have much cylinder pressure while the stuff is trying to work. Mine was more or less coolant seeping from a coolant passage so I didn't think RPM's would have any negative affect on the sealant. I even took her up to 6000 rpm at one point (not running it hard). Took it home, checked for coolant leaks, NO LEAKS! Flushed the system and put antifreeze back in and on I went. I really hope it holds up. Someone here at work used it in a car that actually did have a blown head gasket and they said it's been running for 6 years no problems. Maybe I can get as lucky.