I have a banshee... I run 20 cc domes.. The left side oring keeps busting and shooting out antifreeze out and what not. I need to know why that oring keeps pinching or what not. If you have any comments let me know. I was thinking about changing back to a stock head and not a cool head.. Also my friends say the cylinders might not be flat... Any comments please?

 

Not much help, but any machine shop should be able to tell you if your head/cylinders are warped.