Ok I heard this rumor (it was supposedly on the forum) that if you flush your radiator with water like 4-5 times running it after each time and then putting in that Bars sealer or radiator stop leak stuff that it can fix that bad O ring problem. Right now I can only drive my car for like 20min before the add coolant light comes on and I really want to go to the rx7 store meet on the 17th. So if this really works or if anyone has tried or heard anything about it let me know.

BTW when the add coolant light comes on how long do you have before the engine starts overheating?

 

It works for many but it has its limitations. It worked on my old motor.

Do a search for "copper block weld".